Pentair 87300400Z – Tank-Body O-Ring (Clean & Clear / Posi-Clear / Warrior / EasyClean Filters)
The 87300400Z is a large-diameter body O-ring designed to seal the two halves of select Pentair filter tanks. It helps maintain an airtight, watertight seal under pressure — preventing leaks and ensuring efficient filtration.
Key Features
- OEM-grade replacement O-ring for Clean & Clear, Posi-Clear, Predator, Warrior, EasyClean (DE) and other Pentair filter tanks.
- Approximately 9.5″ outer diameter — matches the original design for proper sealing between tank halves.
- Constructed from pool-rated elastomer (Buna-N or similar) to resist chlorine, salt water, and common pool chemicals.
- Simple to replace — allows you to restore proper tank sealing and eliminate leaks without replacing the entire filter.
Specifications
- Manufacturer: Pentair
- Part Number: 87300400Z
- Type: Body O-Ring (Tank Seal)
- Outer Diameter: Approx. 9.5 inches
- Material: Pool-rated rubber/elastomer
- Compatible With: Pentair Clean & Clear, Posi-Clear, Predator, Warrior, EasyClean DE (and similar) filter tanks
When & Why to Use
Install or replace the 87300400Z when your filter tank exhibits signs of leaks between the top and bottom halves, loses pressure or becomes difficult to seal, or after long-term use when the original gasket has become brittle or deformed. Replacing this seal restores proper tank pressure and filtration performance.
Installation & Maintenance Tips
- Shut off the pump and fully drain the filter before disassembly.
- Remove the old O-ring and clean the sealing surfaces thoroughly of sand, debris, or chemical buildup.
- Lightly lubricate the new O-ring with a small amount of pool-safe silicone (if manufacturer recommends) to assist in sealing.
- Ensure even alignment of tank halves before tightening clamp / band for a zero-leak fit.
- Inspect the O-ring each season — replace at first sign of cracking, flattening, or embedded debris to maintain sealing integrity.
