Cts O Ring X 10 For Gem Filter

Cts O Ring X 10 For Gem Filter

The CTS O-Ring (Pack of 10) (Product Code: S-239241) is a essential maintenance component for Gem Oil Tank Sight Gauges. These gauges are a staple on domestic heating oil tanks, combining a level indicator with an integrated paper filter.

The O-ring provides the critical seal between the filter's alloy bowl and the main gauge body. Because this seal must be broken every time the filter is cleaned or replaced, having a pack of 10 is the standard for service engineers and homeowners who want to ensure a leak-proof finish after every annual service.

Key Technical Specifications

Part Number: 239241

Quantity: Pack of 10 O-rings.

Compatibility: Specifically for the CTS Gem Gauge Filter (e.g., used with the Gem 4000 filter element).

Material: Oil-resistant nitrile rubber (Buna-N).

Function: Seals the alloy filter bowl to the gauge body to prevent fuel leakage and air ingress.

Why Replace the O-Ring?

Compression Set: Over time, the rubber flattens and loses its ability to "spring back," which can lead to weeping leaks.

Chemical Degradation: Constant exposure to kerosene or gas oil can cause the rubber to swell or harden.

Service Protocol: It is best practice to replace the O-ring whenever the filter is inspected. A "weeping" sight gauge is a common reason for oil odors and environmental contamination around the tank base.

Installation Best Practices

Isolate: Use the integrated pull/push isolation valve on the Gem Gauge to stop the flow from the tank.

Clean: Unscrew the alloy bowl and remove the old filter and O-ring. Thoroughly clean the seating groove on the gauge body.

Lube: Apply a tiny amount of clean heating oil or silicone grease to the new O-ring before fitting. This helps it seat correctly without twisting or pinching.

Hand-Tighten: Tighten the alloy bowl firmly by hand. Over-tightening with a wrench can crush the O-ring or damage the threads on the zinc-plated body.

Essential Companion Products

Filter Pack: Cts Gem Filter & O Ring Gem4000 (Single filter and seal kit).

Bulk Seals: Cts O Ring X 10 For Gem Filter

Complete Kit: Gem Heating Oil Tank Sight Gauge

Specialist Support and Local Collection

We stock these O-ring packs for immediate collection at 61 Fullers Road, E18 2QB. These are often bought alongside the Gem4000 40-micron paper elements.