Pentair Diffuser O-Ring 3/16" x 4-7/8" | EQ Series Pump | 350037Z C8380 valve positions lose isolation —

valve positions lose isolation — resulting in flow bypass

Tests for: Salinity

and scrubber in the Racer cleaner wear down

Brand Equipment Line Model / Part Number Notes Pentair ETi 250 — ETi Series Pool and Spa Heater ETi-250 — Pentair ETi 250 — ETi Series Pool and Spa Heater ETi250 — Pentair ETi® 400 Heater — ETi Series ETi400 — Compatibility is based on Pentair parts documentation and available OEM records

Pentair Diffuser O-Ring 3/16" x 4-7/8" | EQ Series Pump | 350037Z C8380 valve positions lose isolation —The Pentair 350037 is the OEM replacement diffuser O ring for the EQ Series Commercial Plastic Pump, sized 3 16" x 4 7 8". IMPORTANT: LUBRICATION REQUIRED SOLD SEPARATELY Always lubricate this O ring with a silicone based lubricant before installation. We carry the Pentair R172351 Lifeguard Silicone Lubricant the OEM matched product for Pentair equipment. This O ring seals the diffuser assembly within the EQ Series pump, preventing bypass of water