Pentair 1 1/4" Star™ Polymeric Air Relief Strainer

The Pentair 1 1/4" Star™ Polymeric Air Relief Strainer (part number 191329) is a specialized internal fluid-safety hardware component engineered exclusively for the internal air-bleed networks of legacy Pentair PacFab Star Polymeric and Star series Diatomaceous Earth (D.E.) pool and spa filtration systems. Injection-molded from a porous, high-impact thermoplastic polymer matrix, this ultra-compact component measures 1-1/4 inches in length, 1-1/4 inches in width, and 1 inch in height. Its primary operational role is to serve as a fine mechanical screening barrier anchored at the collection intake tip of the internal automatic air relief tube at the absolute peak of the filter tank core.

As water floods the pressure vessel, this strainer allows trapped air pockets to be continuously and safely siphoned out of the tank dome while physically blocking fine D.E. powder, loose dirt, or debris from bypassing the filter grids and returning to the clean pool water circuit. This automated ventilation prevents dangerous air-bound structural shock waves, eliminates systemic pressure-locks, and ensures the filter vessel can safely maintain standard hydraulic operating parameters up to 50 PSI without weeping or leaking under pump vibration surges. Built to remain permanently submerged in a highly dynamic, chemical-rich environment, its resilient polymer frame completely resists brittleness, clogging, and corrosive degradation from high-strength pool sanitizers like chlorine, bromine, and winterizing acid flushes. Due to its miniature, ultra-lightweight structural profile, this individual air relief strainer carries a nominal product and shipping weight of approximately 0.01 to 0.03 pounds (about 0.16 to 0.48 ounces).