Davey - Crystal Clear ER 135/180 Cartridge Filter Lid O-Ring - 33367

Davey – Crystal Clear ER 135/180 Cartridge Filter Lid O-Ring

This is the genuine Davey replacement lid O-ring (part 33367) for the Crystal Clear ER 135 (DCC135EU) and Crystal Clear ER 180 (DCC180EU) cartridge filters. It forms the pressure-tight seal between the filter tank body and its lid, preventing water leaks during normal pool filtration operation. Replacing this O-ring is one of the most common and cost-effective maintenance tasks on these filters.

Compatibility

This O-ring is designed specifically for the Davey Crystal Clear ER Series cartridge filters in the 135 sq ft (DCC135EU) and 180 sq ft (DCC180EU) variants — both suited to in-ground and above-ground swimming pools. It is not confirmed to fit other Crystal Clear sub-series or larger models; always verify your filter model before ordering.

Why Genuine Matters

A Davey genuine OEM O-ring is moulded to the exact profile and durometer required for the ER Series lid seat, ensuring a reliable water-tight fit at the filter’s maximum operating pressure of 250 kPa. Non-genuine O-rings may not seat correctly, leading to leaks or premature failure. Always lubricate the O-ring with a silicone-based lubricant (such as Hydroslip) when refitting — never use petroleum-based products, as these cause rubber to swell and distort.

Installation

Before replacing the O-ring, relieve all internal filter pressure and switch off the pump. Remove the filter lid, take out the old O-ring, clean the groove thoroughly, apply a thin coat of silicone lubricant to the new O-ring, seat it evenly in the groove, and refit the lid hand-tight. No sealants, glues, or silicone adhesives are required or recommended on this joint.