SWIMABLES FNS PLUS STAINLESS STEEL AIR VENT 3/4" (CC2) REPLACES: 172855

This premium, budget-friendly aftermarket part is a direct replacement for the Pentair 172855 air vent strainer. Installed internally at the top of the filter grid assembly, this crucial component allows trapped air to escape safely from the tank during system startup, preventing hazardous pressure spikes while keeping fine debris from clogging your manual air relief system.