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561.414.1046

Pentair O-ring

  • o rings

    Pentair EQ Series O-Ring285mm ID x 9.5mm C/S, Buna 70 (11-1/4 in. x 3/8 in.)

    Pentair EQ Series O-Ring285mm ID x 9.5mm C/S, Buna 70 (11-1/4 in. x 3/8 in.)

    This is a large-bore replacement O-ring for Pentair EQ series commercial pool pumps, measuring 285mm inside diameter by 9.5mm cross section — 11-1/4 in. nominal by .375 in. actual in inch sizing. It is cut and vulcanized from Buna-N 70 durometer cord, which is how rings of this diameter are built, and is supplied as a direct-fit replacement for the original ring. Built to OEM-equivalent standards or higher.

    Pentair EQ Series O-Ring – Size Reference
    Measure your old ring two ways: straight across the inside of the hole, and across the thickness of the rubber cord. Both have to match.
    Dimension Metric Inch (nominal) Inch (actual)
    Inside diameter (ID) 285 mm 11-1/4 in. 11.22 in.
    Cross section (C/S) 9.5 mm 3/8 in. .375 in.
    Outside diameter (OD) 304 mm 12 in. 11.97 in.
    Material: Buna-N (Nitrile, NBR), 70 durometer  ·  Construction: vulcanized cord, joined and cured  ·  Colour: black  ·  Guide temperature range: -30°F to 250°F
    Not sure this is your ring? Text a photo of the old O-ring and your pump nameplate to 561-414-1046 — we’ll match it. No purchase required.

    What you get

    • One Pentair EQ series O-ring, 285mm ID x 9.5mm cross section

    • Buna-N 70 durometer, vulcanized construction

    Applications

    • Pentair EQ series commercial pool pumps — EQ, EQK, EQKT, EQW and EQWK models

    • Commercial and municipal swimming pools, water parks and aquatic centres

    • Hotel, resort, school and health club pool plant rooms

    • Any large-bore pump or filter housing calling for an 11-1/4 in. x 3/8 in. Buna O-ring

    Why vulcanized

    At this diameter an O-ring is made by cutting Buna cord to length and vulcanizing the ends together, rather than moulding the whole ring in one piece. It is the standard method for large-bore rings and gives you the same sealing cord and the same compression as a moulded ring, at a size no mould produces economically. Fit it clean, lightly lubricated, and seated flat in its groove with no twist.

    Size spellings

    285mm x 9.5mm = 285 x 9.5 = 285mm ID x 9.5mm C/S = 11-1/4 in. x 3/8 in. = 11.25 x .375 = 11-1/4 x .375

    Servicing the whole pump?We stock O-rings, gaskets, mechanical seals and shaft sleeves for commercial and residential pool pumps.

    Doing the job yourself? Read How to Replace a Mechanical Pump Seal.

    Weight .15 lbs
    Dimensions 6 × 6 × 2 in