Single Spring Seal
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SPS-205 Mechanical Seal (PS-205 Equivalent) – 1-3/4″
SPS-205 Mechanical Seal (PS-205 Equivalent) – 1-3/4″
Item #N/A
Single Spring Mechanical Seal SPS-205 | PS-205 Equivalent
SPS-205 single spring mechanical seal, equivalent to industry standard PS-205 / 205. Fits 1-3/4″ shaft with 2.500″×0.500″ seat and Type E/1 rotary head.
Typical applications: Centrifugal pumps, mixers, and other rotating equipment.
Key specs: Shaft size: 1-3/4″ single spring seal • Seat: 2.500″ x 0.500″ • Rotary OD: 2.402″ • Working length: 2.000″
Design & construction:
Rotary head Type E/1. Electro-polished 316 stainless steel metal parts. Elastomeric bellows. Non-directional (independent of shaft rotation).
Materials available (choose from dropdown)
-
CAR/CER/NIT — Carbon vs. Ceramic faces, Nitrile elastomers
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CAR/CER/VIT — Carbon vs. Ceramic faces, Viton/FKM elastomers
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SIC/SIC/VIT — Silicon Carbide vs. Silicon Carbide faces, Viton/FKM elastomers
Please click “specifications” below for OEM numbers and Pump Nameplate Data
Both PS replacements? Which should I choose? Check out more on our Seal House Seal Guide
Seal Model Product Line Replaces Features & Focus 205C N Line PS-514 Easy installation & broad compatibility SPS-205 SPS Line PS-514 Premium build for longevity & like for like replacement.
SPS Line
Same Fit. Lasting Reliability.
Our SPS single-spring seals are like-for-like replacements for industry-standard E/1, D/2, and C/21 heads—delivering the same fit and function with upgraded materials designed for extended service life.
What sets SPS apart:
-
Heavier elastomer bellows for improved structural integrity and stability under pressure
-
Resin-impregnated, abrasion-resistant carbon faces — double-density carbon designed for enhanced hardness and durability
-
316/304 stainless steel components for superior corrosion protection across E/1, D/2, and C/21 head styles
-
Precision-finished rotary heads with a brushed appearance for a high-quality machined look and consistent sealing performance
-
Built to exacting standards for dependable performance across a wide range of pump applications
Engineered to rigorous standards, SPS seals provide a durable, dependable alternative to common aftermarket or OEM options—compare them against your current line and see the difference.
Explore our full lineup of Single Spring Seals—PS replacements, pool/spa seals, and our SPS line.
Looking for more? Shop Pump Repair Kits, Parts & Accessories, and Gaskets.
SPS-278 Mechanical Seal (PS-278 Cup) – 2-3/8″
SPS-278 Mechanical Seal (PS-278 Cup) – 2-3/8″
Item #N/A
Single Spring Mechanical Seal SPS-278 | PS-278 cup Equivalent
SPS-278 is a single spring mechanical seal equal to industry standard 278 / PS-278 cup.
Typical applications: Centrifugal pumps, mixers, and other rotating equipment.
Key specs: Shaft size: 2-3/8″ single spring seal • Seat: 3.250″ x .562″ cup • Rotary OD: 3.083″ • Working length: 2.500″
Design & construction:
Rotary head Type E/1. Electro-polished 316 stainless steel metal parts. Elastomeric bellows. Non-directional (independent of shaft rotation).
Materials available (choose from dropdown)
-
CAR/CER/NIT — Carbon vs. Ceramic faces, Nitrile elastomers
-
CAR/CER/VIT — Carbon vs. Ceramic faces, Viton/FKM elastomers
-
SIC/SIC/VIT — Silicon Carbide vs. Silicon Carbide faces, Viton/FKM elastomers
Please click “specifications” below for OEM numbers and Pump Nameplate Data
SPS Line
Same Fit. Lasting Reliability.
Our SPS single-spring seals are like-for-like replacements for industry-standard E/1, D/2, and C/21 heads—delivering the same fit and function with upgraded materials designed for extended service life.
What sets SPS apart:
-
Heavier elastomer bellows for improved structural integrity and stability under pressure
-
Resin-impregnated, abrasion-resistant carbon faces — double-density carbon designed for enhanced hardness and durability
-
316/304 stainless steel components for superior corrosion protection across E/1, D/2, and C/21 head styles
-
Precision-finished rotary heads with a brushed appearance for a high-quality machined look and consistent sealing performance
-
Built to exacting standards for dependable performance across a wide range of pump applications
Engineered to rigorous standards, SPS seals provide a durable, dependable alternative to common aftermarket or OEM options—compare them against your current line and see the difference.
Explore our full lineup of Single Spring Seals—PS replacements, pool/spa seals, and our SPS line.
Looking for more? Shop Pump Repair Kits, Parts & Accessories, and Gaskets.
SPS-279 Mechanical Seal (PS-279 Cup) – 2-1/2″
SPS-279 Mechanical Seal (PS-279 Cup) – 2-1/2″
Item #N/A
Single Spring Mechanical Seal SPS-279 | PS-279 cup Equivalent
SPS-279 is a single spring mechanical seal equal to industry standard 279 / PS-279 cup
Typical applications: Centrifugal pumps, mixers, and other rotating equipment.
Key specs: Shaft size: 2-1/2″ single spring seal • Seat: 3.375″ x .562″ cup • Rotary OD: 3.210″ • Working length: 2.500″
Design & construction:
Rotary head Type E/1. Electro-polished 316 stainless steel metal parts. Elastomeric bellows. Non-directional (independent of shaft rotation).
Materials available (choose from dropdown)
-
CAR/CER/NIT — Carbon vs. Ceramic faces, Nitrile elastomers
-
CAR/CER/VIT — Carbon vs. Ceramic faces, Viton/FKM elastomers
-
SIC/SIC/VIT — Silicon Carbide vs. Silicon Carbide faces, Viton/FKM elastomers
Please click “specifications” below for OEM numbers and Pump Nameplate Data
SPS Line
Same Fit. Lasting Reliability.
Our SPS single-spring seals are like-for-like replacements for industry-standard E/1, D/2, and C/21 heads—delivering the same fit and function with upgraded materials designed for extended service life.
What sets SPS apart:
-
Heavier elastomer bellows for improved structural integrity and stability under pressure
-
Resin-impregnated, abrasion-resistant carbon faces — double-density carbon designed for enhanced hardness and durability
-
316/304 stainless steel components for superior corrosion protection across E/1, D/2, and C/21 head styles
-
Precision-finished rotary heads with a brushed appearance for a high-quality machined look and consistent sealing performance
-
Built to exacting standards for dependable performance across a wide range of pump applications
Engineered to rigorous standards, SPS seals provide a durable, dependable alternative to common aftermarket or OEM options—compare them against your current line and see the difference.
Explore our full lineup of Single Spring Seals—PS replacements, pool/spa seals, and our SPS line.
Looking for more? Shop Pump Repair Kits, Parts & Accessories, and Gaskets.
SPS-3025 Mechanical Seal (PS-3025) – 1-5/8″
SPS-3025 Mechanical Seal (PS-3025) – 1-5/8″
Single Spring Mechanical Seal SPS-3025 | PS-3025 Equivalent
SPS-3025 single spring mechanical seal, PS-3025 / 3025 equivalent. Fits 1-5/8″ shaft with 2.375″×0.500″ seat and Type D/2 rotary head
Typical applications: Centrifugal pumps, mixers, and other rotating equipment.
Key specs: Shaft size: 1-5/8″ single spring seal • Seat: 2.375″ x 0.500″ • Rotary OD: 2.636″ • Working length: 1.375″
Design & construction:
Rotary head Type D/2. Electro-polished 304 stainless steel metal parts. Elastomeric bellows. Non-directional (independent of shaft rotation).Material: CAR/SIC/EPDM — Carbon vs. Silicon Carbide, EPDM elastomers
SPS Line
Same Fit. Lasting Reliability.
Our SPS single-spring seals are like-for-like replacements for industry-standard E/1, D/2, and C/21 heads—delivering the same fit and function with upgraded materials designed for extended service life.
What sets SPS apart:
-
Heavier elastomer bellows for improved structural integrity and stability under pressure
-
Resin-impregnated, abrasion-resistant carbon faces — double-density carbon designed for enhanced hardness and durability
-
316/304 stainless steel components for superior corrosion protection across E/1, D/2, and C/21 head styles
-
Precision-finished rotary heads with a brushed appearance for a high-quality machined look and consistent sealing performance
-
Built to exacting standards for dependable performance across a wide range of pump applications
Engineered to rigorous standards, SPS seals provide a durable, dependable alternative to common aftermarket or OEM options—compare them against your current line and see the difference.
Explore our full lineup of Single Spring Seals—PS replacements, pool/spa seals, and our SPS line.
Looking for more? Shop Pump Repair Kits, Parts & Accessories, and Gaskets.
SPS-323 Mechanical Seal (PS-323) – 2-1/4″
SPS-323 Mechanical Seal (PS-323) – 2-1/4″
Single Spring Mechanical Seal SPS-323 | PS-323 Equivalent
323c single spring mechanical seal, PS-323 / 323 equivalent. Fits 2-1/4″ shaft with 3.125″× 0.562″ seat and rotary head Type E/1
Shaft size: 2-1/4″ • Seat: 3.125″ × 0.562″ cup • Rotary OD: 3.150″ • Working length: 2.375″
Typical applications: Centrifugal pumps, mixers, and other rotating equipment.
Design & construction:
Rotary head Type E/1. Electro-polished 316 stainless steel metal parts. Elastomeric bellows. Non-directional (independent of shaft rotation)
Materials available
-
CAR/CER/NIT — Carbon vs. Ceramic faces, Nitrile elastomers
Both PS replacements? Which should I choose? Check out more on our Seal House Seal Guide
Seal Model Product Line Replaces Features & Focus 323C N Line PS-514 Easy installation & broad compatibility SPS-323 SPS Line PS-514 Premium build for longevity & like for like replacement.
SPS Line
Same Fit. Lasting Reliability.
Our SPS single-spring seals are like-for-like replacements for industry-standard E/1, D/2, and C/21 heads—delivering the same fit and function with upgraded materials designed for extended service life.
What sets SPS apart:
-
Heavier elastomer bellows for improved structural integrity and stability under pressure
-
Resin-impregnated, abrasion-resistant carbon faces — double-density carbon designed for enhanced hardness and durability
-
316/304 stainless steel components for superior corrosion protection across E/1, D/2, and C/21 head styles
-
Precision-finished rotary heads with a brushed appearance for a high-quality machined look and consistent sealing performance
-
Built to exacting standards for dependable performance across a wide range of pump applications
Engineered to rigorous standards, SPS seals provide a durable, dependable alternative to common aftermarket or OEM options—compare them against your current line and see the difference.
Explore our full lineup of Single Spring Seals—PS replacements, pool/spa seals, and our SPS line.
Looking for more? Shop Pump Repair Kits, Parts & Accessories, and Gaskets.
Please click “specifications” below for OEM numbers and Pump Nameplate Data
SPS-324 Mechanical Seal (PS-324 Cup) – 3″
SPS-324 Mechanical Seal (PS-324 Cup) – 3″
Item #N/A
Single Spring Mechanical Seal SPS-324 | PS-324 cup Equivalent
SPS-324 single spring mechanical seal, PS-324 / 324 cup equivalent. Fits 3″ shaft with 3.875″×.625″ seat and Type E/1 rotary head.
Typical applications: Centrifugal pumps, mixers, and other rotating equipment.
Key specs: Shaft size: 3″ single spring seal • Seat: 3.875″ x .625″ cup • Rotary OD: 3.770″ • Working length: 2.875″
Design & construction:
Rotary head Type E/1. Electro-polished 316 stainless steel metal parts. Elastomeric bellows. Non-directional (independent of shaft rotation).
Materials available (choose from dropdown)
-
CAR/CER/NIT — Carbon vs. Ceramic faces, Nitrile elastomers
-
CAR/CER/VIT — Carbon vs. Ceramic faces, Viton/FKM elastomers
-
SIC/SIC/VIT — Silicon Carbide vs. Silicon Carbide faces, Viton/FKM elastomers
Please click “specifications” below for OEM numbers and Pump Nameplate Data
SPS Line
Same Fit. Lasting Reliability.
Our SPS single-spring seals are like-for-like replacements for industry-standard E/1, D/2, and C/21 heads—delivering the same fit and function with upgraded materials designed for extended service life.
What sets SPS apart:
-
Heavier elastomer bellows for improved structural integrity and stability under pressure
-
Resin-impregnated, abrasion-resistant carbon faces — double-density carbon designed for enhanced hardness and durability
-
316/304 stainless steel components for superior corrosion protection across E/1, D/2, and C/21 head styles
-
Precision-finished rotary heads with a brushed appearance for a high-quality machined look and consistent sealing performance
-
Built to exacting standards for dependable performance across a wide range of pump applications
Engineered to rigorous standards, SPS seals provide a durable, dependable alternative to common aftermarket or OEM options—compare them against your current line and see the difference.
Explore our full lineup of Single Spring Seals—PS replacements, pool/spa seals, and our SPS line.
Looking for more? Shop Pump Repair Kits, Parts & Accessories, and Gaskets.
SPS-514 Mechanical Seal (PS-514) – 1-5/8″
SPS-514 Mechanical Seal (PS-514) – 1-5/8″
Item #N/A
Single Spring Mechanical Seal SPS-514 | PS-514 Equivalent
SPS-514 single spring mechanical seal, PS-514 / 514 equivalent. Fits 1-5/8″ shaft with 2.37″×0.500″ seat and Type D/2 rotary head.
Typical applications: Centrifugal pumps, mixers, and other rotating equipment.
Key specs: Shaft size: 1-5/8″ single spring seal • Seat: 2.37″ x 0.500″ • Rotary OD: 2.185″ • Working length: 1.375″
Design & construction:
Rotary head Type D/2. Electro-polished 304 stainless steel metal parts. Elastomeric bellows. Non-directional (independent of shaft rotation).
Materials available (choose from dropdown)
-
CAR/CER/NIT — Carbon vs. Ceramic faces, Nitrile elastomers
-
CAR/CER/VIT — Carbon vs. Ceramic faces, Viton/FKM elastomers
-
SIC/SIC/VIT — Silicon Carbide vs. Silicon Carbide faces, Viton/FKM elastomers
-
SIC/SIC/EPR — Silicon Carbide vs. Silicon Carbide faces, EPR elastomers
Please click “specifications” below for OEM numbers and Pump Nameplate Data
Both PS replacements? Which should I choose? Check out more on our Seal House Seal Guide
Seal Model Product Line Replaces Features & Focus 514C N Line PS-514 Easy installation & broad compatibility SPS-514 SPS Line PS-514 Premium build for longevity & like for like replacement.
SPS Line
Same Fit. Lasting Reliability.
Our SPS single-spring seals are like-for-like replacements for industry-standard E/1, D/2, and C/21 heads—delivering the same fit and function with upgraded materials designed for extended service life.
What sets SPS apart:
-
Heavier elastomer bellows for improved structural integrity and stability under pressure
-
Resin-impregnated, abrasion-resistant carbon faces — double-density carbon designed for enhanced hardness and durability
-
316/304 stainless steel components for superior corrosion protection across E/1, D/2, and C/21 head styles
-
Precision-finished rotary heads with a brushed appearance for a high-quality machined look and consistent sealing performance
-
Built to exacting standards for dependable performance across a wide range of pump applications
Engineered to rigorous standards, SPS seals provide a durable, dependable alternative to common aftermarket or OEM options—compare them against your current line and see the difference.
Explore our full lineup of Single Spring Seals—PS replacements, pool/spa seals, and our SPS line.
Looking for more? Shop Pump Repair Kits, Parts & Accessories, and Gaskets.
SPS-838 Mechanical Seal (PS-838 Cup) – 2-3/4″
SPS-838 Mechanical Seal (PS-838 Cup) – 2-3/4″
Item #N/A
Single Spring Mechanical Seal SPS-838 | PS-838 cup Equivalent
SPS-838 single spring mechanical seal, PS-838 / 838 cup equivalent. Fits 2-3/4″ shaft with 3.500″×.625″ seat and Type E/1 rotary head
Typical applications: Centrifugal pumps, mixers, and other rotating equipment.
Key specs: Shaft size: 2-3/4″ single spring seal • Seat: 3.500″ x .625″ cup • Rotary OD: 3.520″ • Working length: 2.875″
Design & construction:
Rotary head Type E/1. Electro-polished 316 stainless steel metal parts. Elastomeric bellows. Non-directional (independent of shaft rotation).
Materials available (choose from dropdown)
-
CAR/CER/NIT — Carbon vs. Ceramic faces, Nitrile elastomers
-
CAR/CER/VIT — Carbon vs. Ceramic faces, Viton/FKM elastomers
-
SIC/SIC/VIT — Silicon Carbide vs. Silicon Carbide faces, Viton/FKM elastomers
Please click “specifications” below for OEM numbers and Pump Nameplate Data
SPS Line
Same Fit. Lasting Reliability.
Our SPS single-spring seals are like-for-like replacements for industry-standard E/1, D/2, and C/21 heads—delivering the same fit and function with upgraded materials designed for extended service life.
What sets SPS apart:
-
Heavier elastomer bellows for improved structural integrity and stability under pressure
-
Resin-impregnated, abrasion-resistant carbon faces — double-density carbon designed for enhanced hardness and durability
-
316/304 stainless steel components for superior corrosion protection across E/1, D/2, and C/21 head styles
-
Precision-finished rotary heads with a brushed appearance for a high-quality machined look and consistent sealing performance
-
Built to exacting standards for dependable performance across a wide range of pump applications
Engineered to rigorous standards, SPS seals provide a durable, dependable alternative to common aftermarket or OEM options—compare them against your current line and see the difference.
Explore our full lineup of Single Spring Seals—PS replacements, pool/spa seals, and our SPS line.
Looking for more? Shop Pump Repair Kits, Parts & Accessories, and Gaskets.
T-78 Mechanical Seal (T-78) – 17MM | 20MM | 25MM | 30MM
T-78 Mechanical Seal (T-78) – 17MM | 20MM | 25MM | 30MM
Item #N/A
T-78 Mechanical Seal (T-78)
Type 78 trash pump mechanical seal designed for Honda, Bluemaxx, and other portable pumps handling dirty or debris-filled water.
The Type 78 mechanical seal is a widely used design for portable “trash pumps,” commonly found in Honda, Bluemaxx, Koshin, and similar pump brands. These seals are specifically built for handling dirty water, sludge, and light debris, making them ideal for construction, agriculture, and dewatering applications.
At Seal House, we standardize this seal with premium Silicon Carbide faces, Buna (Nitrile) elastomers, and 304 stainless steel metal components for improved durability and longer service life in abrasive environments. Please note we offer 17mm in in Carbon/Ceramic for clean water applications.
Available shaft sizes (choose from drop down menu above):
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17mm CAR/CER (carbon/ceramic–for clean water applications)
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17mm SIC/SIC (silicon carbide/silicon carbide)
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25mm SIC/SIC (silicon carbide/silicon carbide)
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30mm SIC/SIC (silicon carbide/silicon carbide)
OEM & Cross Reference
Koshin KTH-80X
OEM Part Number: 3220115678 (25mm)
Commonly used in Honda WT, WB, HL, MP and similar trash pump models.
Key Features
Designed for trash pumps & portable pump applications • Silicon Carbide vs Silicon Carbide faces for abrasion resistance • Buna (Nitrile) elastomers for reliable sealing • 304 Stainless Steel metal parts • Direct replacement for many OEM configurations • Built for dirty water and light solids handling
Applications
Trash pumps (dirty water / solids handling) • Construction site dewatering • Agricultural irrigation pumps • Rental pump fleets • Portable gasoline/diesel pumps
Important Installation & Design Note (READ BEFORE INSTALLING)
Unlike standard mechanical seals, the Type 78 operates in a reversed configuration:
The rotating face is installed in a sleeve (impeller side)
The spring portion is stationary in the housingBecause of this, the terminology is different from standard seals:
What is normally called the seat = spring portion (stationary)
What is normally called the rotary = rubber cup + face assemblyDimensional Reference Guide
For this seal type, dimensions are defined as follows:
D2 = Rotary face OD (rubber cup fit size)
L2 = Thickness of rotary ring + rubber cup
D1 = Stationary (spring portion) rubber cup OD fit size
L1 = Height of rubber cup on stationary portion
L = Overall working length when installedAlways verify dimensions against your pump, as installation differs from standard mechanical seals.
Explore our full line up of OEM seals
Looking for more? Shop Pump Repair Kits, Shaft Seals and Gaskets
Have questions? Call us anytime- we’re here to help
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