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561.414.1046

Bell & Gossett Mechanical Seals

  • PS replacement mechanical seal

    437c Mechanical Seal (PS-437) — 3/4 in.Bell & Gossett 1512-PD39, BPD39 & 60A Pumps

    437c Mechanical Seal (PS-437) — 3/4 in.Bell & Gossett 1512-PD39, BPD39 & 60A Pumps

    Item #SH-437c

    The 437c single spring mechanical seal is Seal House USA’s N Line replacement for the PS-437 — an N-11 crimped-head seal for a 3/4 in. shaft with a 1.275 x .281 cup seat, used in Bell & Gossett pumps and sold by them as Universal Kit #2. Equal to the PS-437, not an original PS part. Built to OEM-equivalent standards or higher.

    Specifications

    Shaft Size3/4 in.19.05 mm
    Head TypeN-11crimped head · John Crane 21
    Head ODCONFIRM in.
    Working Length0.875 in.operating height
    Seat OD1.275 in.
    Seat Thickness0.281 in.
    Seat MountCup mounted
    Metal PartsStainless Steel 

    Single spring · elastomeric bellows · non-directional, runs either rotation · carbon or silicon carbide faces, Nitrile or Viton elastomers

    Choose Your Seal Material3 seal materials available. Same seal, same dimensions — only the seal faces and rubber parts change. Find what your pump runs, then choose that option from the drop-down menu above.

    Standard – Carbon/Ceramic/NitrileCarbon face, ceramic seat, Nitrile rubberCAR/CER/NIT  ·  BCDJF  ·  Max 225°F Clean water at neutral pH — hydronic heating, chilled water, booster and general-service pumps. This is the standard build.
    Upgrade – Carbon/Ceramic/VitonCarbon face, ceramic seat, Viton rubberCAR/CER/VIT  ·  VCDJF  ·  Max 400°F Your pump runs hot, or handles glycol, oils, fuels, bleach or other chemicals that break down standard Nitrile.
    Top gradeHeavy Duty – Silicon Carbide/VitonSilicon carbide face and seat, Viton rubberSIC/SIC/VIT  ·  VLDLF  ·  Max 400°F Gritty or dirty water, condensate with scale, or any pump where seals keep wearing out early. The hardest faces we offer.

    Not sure which material? Call or text a photo of your pump nameplate to 561-414-1046 — no purchase required.

    Cross ReferencesFind your pump brand, then match the number on your old seal or nameplate.

    Pump Brand OEM Part No. Nameplate & Notes
    Bell & Gossett (A Xylem Brand) 172553 · 185260 · 186433 · 186499 1512-PD39, BPD39 and 60A — sold by Bell & Gossett as Universal Kit #2

    Seal House USA provides aftermarket replacement parts. The 437c is equal to — not manufactured by — the listed OEMs or US Seal Mfg. Any OEM and PS names or numbers are used strictly for cross-reference. We are an independent supplier.

    Other part numbers & search terms
    Part number: PS-437 = PS437 = PS 437 = 437 = 437c = 437 C = 437-c
    Bell & Gossett: Kit #2 = Kit 2 = Universal Kit #2 · 172553 · 185260 · 186433 · 186499 · 1512-PD39 = 1512 PD39 · BPD39 · 60A
    Size: 3/4 mechanical seal = .750 mechanical seal = 19.05 mm seal · 1.275 x 0.281 seat · 0.875 working length = 0.875 operating height
    Head type: N-11 seal = N11 seal · John Crane Type 21 = JC 21 = C21 · replaces the Type D / John Crane 2 head at the same working length and seat
    Materials: BCDJF carbon ceramic nitrile · VCDJF carbon ceramic Viton / FKM · VLDLF SiC / SiC Viton / FKM

    Other Sizes in the N LineThree N Line seals fit a 3/4 in. shaft. The seat is what separates them — measure yours before ordering.

    Seal Shaft Working Length Seat
    437c — this seal 3/4 in. .875 1.275 x .281
    358c (PS-358) 3/4 in. .875 1.375 x .406
    877c (PS-877) 3/4 in. .718 1.375 x .406
    4518c (PS-4518) 3/4 in. 1.250 1.375 x .406
    359c (PS-359) 5/8 in. .875 1.250 x .406
    309c (PS-309) 7/8 in. .937 1.500 x .406

    Not the one? See all N Line / PS replacement seals or text a photo to 561-414-1046.

    Weight .25 lbs
    Dimensions 1 × 1 × 2 in
  • PS-4349 mechanical seal, Bell & Gossett 1/2 inch, P86261, upgraded EPDM/SiC/SiC, 2100 series

    SPS-4349 Mechanical SealBell & Gossett 1/2″

    SPS-4349 Mechanical SealBell & Gossett 1/2″

    Item #BG-PS-4349

    PS-4349 Mechanical Seal — Bell & Gossett 1/2″

    The PS-4349 mechanical seal is a direct-fit 1/2″ shaft seal for Bell & Gossett 2100 series pumps, cross-referenced to B&G P86261. It is built to OEM-equivalent standards or higher, and we supply it with an upgraded Silicon Carbide/Silicon Carbide face combination — a step up from the standard carbon version — for longer service life.

    Upgraded Material 
    The OEM seal (186046LF / 186047LF) uses an EPDM/Carbon/Silicon Carbide build. We supply the PS-4349 with an upgraded EPDM/Silicon Carbide/Silicon Carbide combination — both faces in hard silicon carbide — for better wear resistance and longer service life in demanding duty.

    At a Glance:

    • Reference: PS-4349 / B&G P86261

    • Series: Bell & Gossett 2100

    • Shaft size: 1/2″

    • Working length: 0.591″

    • Cup seat: 0.938″ × 0.294″

    • Faces / elastomers: EPDM / SiC / SiC (upgraded)

    • Form: Seal assembly only (O-rings/gaskets sold separately)

    Applications 
    Built for Bell & Gossett 2100 series pumps running the 1/2″ shaft seal. Matching from a worn seal? Confirm your shaft size and cup seat dimensions first, or send a photo of the old seal and your pump nameplate to info@sealhouseusa.com, or call/text 561-414-1046. No purchase required — our seal specialists will match it.

    Explore our full line up of  Bell & Gossett Product and OEM seals 

    Looking for more? Shop Pump Repair Kits, Shaft Seals and Pre-Cut Gaskets

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

    Weight .25 lbs
    Dimensions 1 × 1 × 1 in