Pentair O-Ring for Union | Clean & Clear / Predator Cartridge Filters | 071426Z

The Pentair O-Ring for Union (071426Z) is the OEM replacement union O-ring for Pentair Clean & Clear and Predator cartridge filter systems, and select ThermalFlo heat pump models.

⚠️ 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 union connection on the filter or heat pump plumbing, preventing water from bypassing or weeping at the union joint. A deteriorated or compressed union O-ring is one of the most common causes of minor leaks at filter plumbing connections. Replacing it restores a watertight seal without the need to replace the full union assembly. Match the part number on your existing O-ring before ordering — union O-ring sizes vary by equipment model and connection diameter.

Specifications

Fits Into

Compatibility is based on Pentair parts documentation and available OEM records. This is not an exhaustive list. For certainty, verify the part number in your equipment's manual or on the original part itself before ordering.

Pro Tip

Before installation, apply a thin coat of Pentair R172351 Lifeguard® Silicone Lubricant to the O-ring. This helps it seat evenly in the union groove, prevents tearing during assembly, and extends service life. Never use petroleum-based lubricants — they will degrade rubber O-rings and cause premature failure. While the union is apart, inspect the union threads and mating faces for cracks or buildup before reinstalling.