Pentair Diffuser O-Ring 3/16" x 4-7/8" | EQ Series Pump | 350037Z C8380 you can be certain there’s

you can be certain there’s enough disinfectant to keep the water clean

A worn or cracked O-ring is a common cause of water leaks at filter joints — replacing it restores a watertight seal and returns the filter to proper operating pressure

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

Mechanical Cleaning: Chemicals loosen debris

valve positions lose isolation — resulting in flow bypass

Pentair Diffuser O-Ring 3/16" x 4-7/8" | EQ Series Pump | 350037Z C8380 you can be certain there’sThe 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