The Waterway 805-0207 O-Ring is a genuine OEM replacement seal for ClearWater II and ProClean Plus air-relief valves. It provides a tight, leak free connection between the air-relief valve and filter lid, maintaining proper pressure and flow in both cartridge and D.E. filter systems.

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Key Features

• OEM part number 805-0207 (also referenced as 805-0207B)

• Compatible with ClearWater II Cartridge and D.E. filters as well as ProClean Plus series filters

• Material: chemical-resistant Buna-N rubber designed for pool and spa environments

• Typical size: ~ 9/16" ID × 1/8" thickness

• Restores proper sealing to prevent air or water leaks at the air-relief valve

• Quick, drop in replacement - no tools required

• Economical and essential maintenance item for seasonal filter servicing

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Product Overview
A small yet vital component, the Waterway 805-0207 O-Ring keeps your filter’s air-relief valve properly sealed to prevent leaks or loss of system pressure. When this O-ring wears or cracks, air can enter the filter body, reducing performance and creating safety issues. Replacing it is an easy, low-cost way to maintain your ClearWater II or ProClean Plus filter’s efficiency.

For online catalogs, this part should appear under “Filter Replacement Parts → Air-Relief Valves & Seals.” Highlight compatibility with ClearWater II and ProClean Plus systems and note that it’s an OEM Waterway component — ensuring the correct size, material, and performance fit every time.