Pentair Diffuser O-Ring 3/16" x 4-7/8" | EQ Series Pump | 350037Z Filter Cartridges but if your feeder model

but if your feeder model number differs from those listed

The Unicel PG-1903 is a single partial replacement DE filter grid for vertical grid DE filter systems with 36 square feet of total filtration capacity

Check your filter's manufacture date label — typically found on the tank body or data plate — before ordering

This closure (154575Z) fits Triton C-3 filters manufactured before March 1997

briefly open the air relief valve during startup to confirm air is purging correctly before bringing the filter up to operating pressure

Pentair Diffuser O-Ring 3/16" x 4-7/8" | EQ Series Pump | 350037Z Filter Cartridges but if your feeder modelThe 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