SuperPro O-420-9 tank o-ring for FNS filtersSuperPro Tank O-Ring for FNS Filter, O-420-9 In stock$1699
SuperPro O-420-9 tank o-ring for FNS filters
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SuperPro Tank O-Ring for FNS Filter, O-420-9

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$1699
In stock
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Quick overview

  • Seals the filter tank The o-ring that sits between the upper and lower halves of the FNS tank and keeps the clamp joint watertight.
  • Sized 19-1/8 in. ID Inside diameter is 19-1/8 in. with a 3/8 in. cross section, so it can be measured against the old ring before ordering.
  • Fits the whole FNS range Listed for FNS Polymeric FNS24, FNS36, FNS48 and FNS60.
  • Also fits the Sea Horse tank The same ring is listed for the Sea Horse FSH fiberglass tank.
  • Cross referenced Sold under several part numbers over the years, including O-420, 195008, 4600-5008, 66500 and 90-423-1420.
  • Change it with the tank open A tank o-ring is cheap next to the labor of opening the filter, so replace it any time the band comes off.
Full description and specifications ↓

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Product details

This is the tank o-ring for the FNS filter body, the seal that runs around the joint between the two halves of the tank and holds pressure once the clamp band is torqued down. It measures 19-1/8 in. inside diameter with a 3/8 in. cross section.

What it fits

The ring is listed for the FNS Polymeric FNS24, FNS36, FNS48 and FNS60 filters, and for the Sea Horse FSH fiberglass tank. Over the years the same ring has been sold under several numbers, so a replacement labeled O-420, 195008, 4600-5008, 66500 or 90-423-1420 is the same part.

When to change it

A tank o-ring that has taken a set, flattened or cracked will weep at the band, usually as a slow drip that only shows up once the pump is running. Because the filter has to be opened either way, most techs fit a fresh ring any time the band comes off for a grid service rather than reusing a ring that is already years old. A light film of pool grade silicone lubricant helps it seat cleanly and makes the next teardown easier.

Specifications
Brand SuperPro
Manufacturer part number O-420-9
UPC 601402263019
Type Tank o-ring
Inside diameter 19-1/8"
Cross section 3/8"
Fits FNS Polymeric FNS24, FNS Polymeric FNS36, FNS Polymeric FNS48, FNS Polymeric FNS60, Sea Horse FSH Fiberglass Tank
Substitute part numbers 195008, 4600-5008, 66500, 788379693374, 90-423-1420, O-420
Shipping weight 0.25 lb
Ships Parcel

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Questions and answers

What people ask about this product, answered by our pool techs.

Which filters does this o-ring fit?
It is listed for the FNS Polymeric FNS24, FNS36, FNS48 and FNS60 filters, and for the Sea Horse FSH fiberglass tank.
What size is it?
19-1/8 in. inside diameter with a 3/8 in. cross section. Measure the old ring against those numbers if you are unsure which one you have.
My old ring came in a different part number. Is this the same ring?
It is cross referenced to O-420, 195008, 4600-5008, 66500 and 90-423-1420, so a box printed with one of those numbers is this ring.
Should I lubricate it?
A thin film of pool grade silicone o-ring lubricant helps the ring seat and makes the next opening easier. Do not use a petroleum based grease, which swells the rubber.
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