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2120C Mechanical Seal (PS-2120) – 2-1/2″

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

2120C Mechanical Seal (PS-2120) – 2-1/2″

Brand: VULCAN ENGINEERING

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

$149.50
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  • DESCRIPTION

    Single Spring Mechanical Seal 2120C — 2-1/2″ | PS-2120 Equivalent

    2120c single spring mechanical seal, PS-2120 / 2120 equivalent. Fits 2-1/2″ shaft with 3.375″×0.562″ seat and Type N-11 (Type C/21) rotary head.

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

    Key specs: Shaft size: 2-1/2″ single spring seal • Seat: 3.375″ x 0.562″ • Rotary OD: 3.209″ • Working length: 1.812″

    Design & construction:
    Crimped rotary head (Type N-11)—similar to industry Type C / 21; can also replace Type D / 2 with a simple spring change (in most cases). Electro-polished 304 stainless steel metal parts. Elastomeric bellows. Non-directional (independent of shaft rotation).

    Material: CAR/CER/NIT — Carbon vs. Ceramic faces, Nitrile 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 Reference / Alternative Parts Number

    OEM numbers:

    2120 CAR/CER/NIT: 157599

    Brands: SWABY MFG. COMPANY , WEIR SPECIALTY PUMPS

    Pump Nameplate Data: None available

    Part number variations
    PS-2120
    PS2120
    PS 2120
    2120 seal
    2120 mechanical seal
    2120c
    2120 C
    2120-c

    Size / measurement variations
    2-1/2″ mechanical seal
    2.5″ mechanical seal
    2 1/2 seal
    3.375 × 0.562 seat
    3-3/8 × 9/16 seat
    3.209 rotary OD
    1.812 working length

    Style variations
    N-11 seal
    N11 seal
    Type C/21 seal
    Type 21 mechanical seal
    Type D/2 replacement (spring change)

  • 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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