Pentair Rainbow O-Ring, Cap & Extension | Model 300 Series Automatic Feeder | R172009Z C9407 NSF-50 WG10712SFVE Compatibility is based

NSF-50 WG10712SFVE Compatibility is based on Hayward parts documentation and available OEM records

even coat of silicone-based lubricant to the O-ring before seating it — this prevents tearing during installation and helps the lock ring thread on smoothly without cross-threading

extending the life of the motor

salt water chlorine

pests and debris

Pentair Rainbow O-Ring, Cap & Extension | Model 300 Series Automatic Feeder | R172009Z C9407 NSF-50 WG10712SFVE Compatibility is basedThe Pentair Rainbow O Ring (R172009Z) is the OEM replacement cap and extension O ring for the Rainbow Model 300 Series Automatic Chemical Feeders, including the 300 29X Commercial Size Feeder, the 320 In Line Automatic Feeder, and Rainbow 10" and 20" Extension assemblies. IMPORTANT: LUBRICATION REQUIRED SOLD SEPARATELY Always lubricate this O ring with a silicone based lubricant before installation. We carry the Pentair R172351 Lifeguard Silicone