Pentair 172855 Air Relief Strainer Assembly – ¾″
Part Number: 172855
Description
An OEM replacement air relief strainer assembly designed to safely vent trapped air from D.E. and cartridge filter systems. This part helps maintain proper pressure and flow by preventing air buildup in the filter tank.
Compatibility & Fitment
- Compatible with Pentair FNS, FNS Plus, Clean & Clear, and Quad filters requiring a ¾″ air relief strainer.
- Recommended when the existing relief is cracked, leaking, missing, or unable to vent air properly.
- Drop-in replacement for installations specifying part number 172855.
Features & Specifications
- Size: ¾″ connection port.
- Body dimensions: approximately 1¾″ diameter × 1½″ height.
- Dust and debris screen with stainless mesh and rubber base for long-life service in pool filter environments.
- Helps ensure safe operation by reducing air-pocket related disruptions and maintaining consistent flow.
Installation Notes
Turn off the pump and relieve system pressure. Remove the existing relief assembly and inspect the port threads. Install the new 172855 strainer assembly, hand-tighten and finish with a tool if required. Ensure no leaks and proper air venting, then restore circulation and monitor system behavior.
Maintenance Tip
Inspect the air relief strainer each service interval: ensure the mesh is clean, the rubber base is intact and air is venting freely. Replace immediately if flow is restricted or the body is damaged to maintain filter performance and prevent bubbles or pressure irregularities.
