Hayward O-Ring for ProSeries 23" Sand Filter W3S200 | SX200Z3 UHDSR50 The Hayward Check Valve (ECX4077B1)

The Hayward Check Valve (ECX4077B1) is the OEM replacement check valve for select StarClear cartridge filters and Perflex Extended-Cycle DE filters

⚠️ IMPORTANT: CONFIRM YOUR FILTER'S SQUARE FOOTAGE BEFORE ORDERING

In-Line CL100 Hayward Automatic Chlorine Feeder

Vented sight glass parts are prone to wear from the flapper

Hayward O-Ring for ProSeries 23" Sand Filter W3S200 | SX200Z3 UHDSR50 The Hayward Check Valve (ECX4077B1)The Hayward O Ring (SX200Z3) is the OEM replacement sealing O ring for the ProSeries 23" Top Mount Sand Filter. IMPORTANT: LUBRICATION REQUIRED SOLD SEPARATELY Always lubricate this O ring with a silicone based lubricant before installation to ensure a proper seal and prevent premature cracking. Browse our Pool Plumbing Lubricants for a compatible silicone lubricant. This O ring maintains a watertight seal at its designated seating point on the