O-Ring for White Slimline housings with single O Ring (EPDM)

This single EPDM O-ring from WrekinWater fits white slimline filter housings that use a single sealing groove rather than the twin O-ring design, forming the watertight joint between the sump and the housing head.

Signs this seal needs replacing

• Dripping or weeping around the sump-to-head joint.
• The seal feeling hard, brittle, or sticky rather than soft and pliable.
• Difficulty getting the housing to seal even when fully tightened.
• Visible grooves or flat spots worn into the old O-ring.

On a single O-ring housing, this one seal is doing all the work of holding the sump against the head under mains pressure. Because there's no second O-ring to share the load, wear or perishing here shows up quickly as a leak rather than a gradual pressure drop.

WrekinWater, based in Bettisfield, Shropshire, stocks the correct single O-ring size for this housing type so you don't end up fitting a seal that's a poor match and leaks again within weeks.

How to replace it

1. Isolate the water supply and open a downstream tap to release pressure.
2. Unscrew the sump from the housing head using a housing spanner.
3. Remove the old O-ring from the groove in the head.
4. Clean the groove and lightly lubricate the new O-ring with food-safe silicone grease.
5. Fit the new O-ring and screw the sump back on hand-tight plus a small turn.
6. Restore the water supply and check the joint for leaks.