All Single Spring Seals
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359c
359c
Item #N/A
View ProductSingle Spring Mechanical Seal 359C — 5/8″
Equal to:Industry standard 359 / PS-359
Typical applications: Centrifugal pumps, mixers, and other rotating equipment.
Key specs
5/8″ Single spring mechanical seal with 1.250 x .406″ cup seat , 1.063 rotary OD, .875″ working length
Design & construction
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Crimped rotary head — similar to industry Type C / 21
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Can also replace Type D / 2 heads with a simple spring change (in most cases).
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Electro-polished 304 stainless steel metal parts
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Elastomeric bellows
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Non-directional (independent of shaft rotation)
Materials available
(choose from dropdown menu above)
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CAR/CER/NIC — Carbon vs. Ceramic faces, Nitrile elastomers
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CAR/CER/VIT — Carbon vs. Ceramic faces, Viton elastomers
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SIC/SIC/VIT — Silicon Carbide vs. Silicon Carbide faces, Viton® elastomers
Have questions? Check out our Single Spring Seal Guide or call us anytime—we’re here to help.
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 Pre-Cut Gaskets.
Please click “specifications” below for OEM numbers and Pump Nameplate Data
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361c / 2122
361c / 2122
Item #N/A
View ProductSingle Spring Mechanical Seal 361C / 2122 – Equal to industry standard number 361 / PS-361 as well as PS-2122
Please Note: 361C is a drop-in replacement for U.S. Seal PS-2122 ; Sta-Rite S32013 (and other comparable models), this seal features a smaller-OD rotary for a more universal fit—especially in tight housings and straight-bore/ANSI boxes. The crimped-head design enhances structural integrity and sealing force, delivering higher pressure capability and reliable, long-term performance.
1-1/4″ Single spring mechanical seal with 1.875″ x .437″ cup seat, 1.787″ rotary OD, 1.687″ working length
Crimped rotary head type N-22, equivalent to Pac-Seal T-21 (long w/l) and Burgmann MG9, can replace seal type E & 1.
Electro polished 304SS metal parts.
Single spring mechanical seal, with an elastomeric bellows, independent of the direction of rotation of the shaft. Utilized in centrifugal pumps, mixers, rotating equipment, and further apparatus.
Have questions? Check out our Single Spring Seal Guide or call us anytime—we’re here to help.
Please click “specifications” below for OEM numbers and Pump Nameplate Data
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3793
3793
View ProductMechanical Seal 3793– Equal to industry standard 3793 / PS-3793
3-1/2″ Industry standard G type / John Crane 2100
4.375″ x .625″ seat, 4.402″ rotary OD, 2.189″ working length
Center mount o-ring seat no notch EP/CAR/SIC
SC/SC/EPPlease click “specifications” below for OEM numbers and Pump Nameplate Data
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3804
3804
View ProductMechanical Seal – Equal to industry standard 3804 / PS-3804 / VG-3804
Industry standard G type / John Crane 2100
3.375″ x .562″ seat, 3.268″ rotary OD, 1.811″ working length
Please click “specifications” below for OEM numbers and Pump Nameplate Data
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381C
381C
Item #N/A
View ProductSingle Spring Mechanical Seal 381C – Equal to industry standard number 381 / PS-381, can also replace PS-804 & PS-246
Tapered spring for wide base to fit over impeller hub or other similar feature
1-1/4″ Single spring mechanical seal with 1.875″ x .437″ cup seat, 1.787″ rotary OD, 1.062″ working length
Crimped rotary head type N-33, equivalent to Pac-Seal T-21 (tapered spring) and Burgmann MG9, can replace seal type D & 2 type seal heads.
Electro polished 304SS metal parts.
Single spring mechanical seal, with an elastomeric bellows, independent of the direction of rotation of the shaft. Utilized in centrifugal pumps, mixers, rotating equipment, and further apparatus.
Have questions? Check out our Single Spring Seal Guide or call us anytime—we’re here to help.
Please click “specifications” below for OEM numbers and Pump Nameplate Data
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3866
3866
View ProductEqual to industry standard 3866 / PS-3866 mechanical seal
Mechanical seal Type 166 , T-16; 5/8” shaft size with 1.187″ x .343″ cup seat machined carbon/cermic/viton
For Upgrades/variations: 100 (basic), 957 (premium carbon face), 100cv (molded carbon), 100cvss (silicon/silicon/viton)
Have questions? Check out our Pool/Spa Small Pump Guide or call us anytime—we’re here to help.
Please click “specifications” below for OEM numbers and Pump Nameplate Data
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3867
3867
View ProductEqual to industry standard 3867 / PS-3867 mechanical seal
Mechanical seal Type 166, T-16; 5/8” shaft size with 1.25″ x .406″ cup seat machined carbon/cermic/viton
For Upgrades/variations: 200 (basic), 516 (premium carbon face), 200cv (molded carbon) 200cvss (silicon/silicon/viton)
Have questions? Check out our Pool/Spa Small Pump Guide or call us anytime—we’re here to help.
Please click “specifications” below for OEM numbers and Pump Nameplate Data
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3868
3868
View ProductEqual to industry standard 3868 / PS-3868
Mechanical seal Type 166, T-16; ¾” shaft size with 1.375″ x .406″ cup seat machined carbon/ceramic/viton
For Upgrades/variations: 201 (basic), 851 (premium carbon face), 201cv (molded carbon), 201cvss (silicon/silicon/viton)
Have questions? Check out our Pool/Spa Small Pump Guide or call us anytime—we’re here to help.
Please click “specifications” below for OEM numbers and Pump Nameplate Data
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3883
3883
View ProductMechanical Seal 3883– Equal to industry standard 3883 / PS-3883
1-1/4″ – Industry standard G type / John Crane 2100
1.875″ x .437″ seat, 1.811″ rotary OD, 1.024″ working length
***Please note: At Seal House, we have seen this seal in pumps where OEM manual states U109-220 or U90451SS (this is 3883 in viton material). Our standard replacement is 3883, for non chemical applications and temperatures below 220°F . For chemical service or temperatures above 220°F, you need 3883 with viton material, which is equivalent to OEM U90451SS. Please contact us for viton pricing and delivery
Please click “specifications” below for OEM numbers and Pump Nameplate Data