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309c Mechanical Seal (PS-309) – 7/8″

Type n11, C, 1 Mechanical pump Seal - buy now

309c Mechanical Seal (PS-309) – 7/8″

SKU: N/A Brand: VULCAN ENGINEERING

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

    Single Spring Mechanical Seal 309C — 7/8″ | PS-309 Equivalent

    309c single spring mechanical seal, PS-309 / 309 equivalent. Fits 7/8″ shaft with 1.500″× 0.405″ seat and Type N-11 (Type C/21) rotary head.

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

    Key specs: Shaft size: 7/8″ single spring seal • Seat: 1.500″ x 0.405″ cup • Rotary OD: 1.315″  • Working length: 0.937″

    Design & construction

    Crimped rotary head (type N-11) -similar to industry types such as  C  &  21  while they can also replace type  D / 2  seal heads with a simple spring change in most cases (spring from before). Electro polished 304SS metal parts. Single spring mechanical seal, with an elastomeric bellows, all engineered for non-directional operation (independent of shaft rotation).

    Materials available (choose from dropdown)

    • CAR/CER/NIC — 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 Pre-Cut Gaskets.

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

    OEM numbers:

    309 CAR/CER/NIT: DP0294 , 0030876 , M-3824-B , 0030876 , 907-06033 , 92500000 , 84079-2 , 5679 , 21576A000 , 9842885 , 55-488 , 142-54055 , 50625-2 , 54302 , Q26-394-Y2 , 64262-13C

    309 CAR/CER/VIT: 25271-853 , 5679V

    309 SIC/SIC/VIT: 472-00129

    Brands: BELL & GOSSETT (A XYLEM Brand) , CRANE-DEMING (Division of CRANE PUMPS & SYSTEMS) , CRANE PUMPS & SYSTEMS , DEMPSTER INDUSTRIES, LLC , GECKO ALLIANCE,INC. , GUSHER PUMPS , MEGATOR CORPORATION , MYERS, F.E. , PAUL MUELLER COMPANY , SERFILCO , SKIDMORE PUMP , SOMAT COMPANY (Ice Machines) , WEINMAN® (Division of CRANE PUMPS & SYSTEMS) , XYLEM INC.

    Brands CAR/CER/VIT only: GORMAN-RUPP COMPANY

    Brands SIC/SIC/VIT only: NATIONAL OILWELL VARCO (NOV, INC.)

    Pump Nameplate Data: AC Series

    Part number variations
    PS-309 / PS309 / PS 309
    309 seal / 309 mechanical seal
    309c / 309 C / 309-c

    Size / measurement variations
    7/8″ mechanical seal / 0.875″ seal / 7 8 seal
    1.500 × .405 seat / 1.50 × 0.405 seat / 1-1/2 × .405 seat
    1.315 rotary OD / 1.315″ OD
    0.937 working length / 0.937″ length

    Style variations
    N-11 / N11 / T-N11 seal head
    Type C / Type 21 / C/21
    Type D/2 replacement (spring change)
    ANSI seal chamber compatible (T-N11/N22)

  • PHYSICAL PROPERTIES

    T-N11/N22 Seal Heads

    Our T-N11/N22 type seal heads are designed with a reduced outer diameter, making them fully compatible with ANSI seal chamber dimensions. The rotary portion of our seal is typically smaller than the stationary seat, and can fit straight box bores where many other seals cannot.

    These seals are direct replacements for industry-standard  C / 21 models.

    Note: The N11/N22 seal designs max shaft size is 2.25″. For larger shafts, please refer to our other seal types.

    Have questions? Call us anytime—we’re here to help.

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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