Product Overview

The Pentair 87300400Z is the genuine replacement tank O-ring for Pentair Clean & Clear and Posi-Clear cartridge filters. It sits between the upper and lower tank halves and seals the filter body under the locking clamp ring.

A flattened, cracked or stretched tank O-ring is the most common cause of water leaking from the middle of a cartridge filter. Replacing it with the factory O-ring restores a watertight seal so the filter can hold pressure.

Ideal For

Pentair Clean & Clear cartridge filters

Pentair Posi-Clear cartridge filters

Filters leaking at the tank clamp

Annual filter service and cartridge cleaning

Pool service technicians

Key Features

Genuine Pentair OEM tank O-ring

Seals the upper and lower filter tank halves

Fits Clean & Clear and Posi-Clear filter tanks

Sold individually

Benefits

A fresh tank O-ring stops leaks at the filter body, keeps the filter holding proper pressure and protects your pad from water damage. Replacing it whenever you open the filter is inexpensive insurance against a leak after reassembly.

Specifications

Warranty & Compatibility

Fits Pentair Clean & Clear and Posi-Clear cartridge filter tanks. Confirm your filter model on the tank label before ordering. Lightly lubricate the O-ring with a silicone-based pool lubricant before installing.

Customer-Facing Q&A

Q: What part number is this?
A: This is the Pentair tank O-ring, part number 87300400Z.

Q: Which filters does it fit?
A: Pentair Clean & Clear and Posi-Clear cartridge filters.

Q: My filter leaks around the middle. Is this the part?
A: Most leaks at the tank clamp come from a worn tank O-ring, so this is the usual fix.

Q: Should I lubricate it?
A: Yes. Use a light coat of silicone-based pool lubricant before reassembling the tank.

Q: How many are included?
A: One O-ring.