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978c Mechanical Seal (PS-978) – 1-1/4″

buy PS-381 PS-978 Pump Seal

978c Mechanical Seal (PS-978) – 1-1/4″

SKU: N/A

Weight 1 lbs
Dimensions 8 × 6 × 4 in
QTY Price
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  • DESCRIPTION

    Single Spring Mechanical Seal 978C — 1-1/4″ | PS-978 Equivalent

    978c single spring mechanical seal, PS-978 / 978 equivalent. Fits 1-1/4″ shaft with 1.765″×.365″ seat and Type N-33 (tapered spring) rotary head.

    Typical applications: Centrifugal pumps, mixers, and other rotating equipment.

    Key specs: Shaft size: 1-1/4″ single spring seal • Seat: 1.765″ x 0.365″ • Rotary OD: 1.787″ • Working length: 1.062″

    Design & construction:
    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. Tapered spring for wide base to fit over impeller hub or other similar feature. 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 elastomers

    • 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  Gaskets.

    Please click “specifications” below for OEM numbers and Pump Nameplate Data
  • SPECIFICATIONS
    Cross References / Alternative Part Numbers

    OEM numbers: 186860, 186862 , 45672-20

    Brands: BELL & GOSSETT (A XYLEM Brand) , MARLOW (Division of ITT INDUSTRIES)

    Nameplate Data: [B&G All Iron-Series 1510, 1515, 1531 (Small Frame) Types M1 and M2] , L Series

    Part number variations
    PS-978 / PS978 / PS 978
    978 seal / 978 mechanical seal / 978 pump seal
    978c / 978 C / 978C / 978-c
    186860 / 186862 / 45672-20

    Size / measurement variations
    1-1/4″ mechanical seal / 1.25″ seal / 1 1/4 seal
    1.765 × .365 seat / 1.765 x 0.365 seat
    1.787 rotary OD / 1.787″ OD
    1.062 working length / 1.062″ length

    Style variations
    N-33 / N33 / Type N-33
    tapered spring mechanical seal / tapered spring seal
    Pac-Seal T-21 tapered spring
    Burgmann MG9
    Type D / Type 2 replacement

Disclaimer: Seal House USA provides aftermarket replacement parts. Any OEM names are used strictly for cross-reference. We are an independent supplier.

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