Mazzei (SPSA-1.5-A) Suction Port Screen w- Check Valve - 1.5" FNPT ConnectionMazzei Injector Components Mazzei SPSA 1. 5 A Suction Port Screen Assembly with Check Valve 1. 5" FNPT threaded screen assembly engineered to protect injector suction ports from debris while preventing backflow in chemical injection systems Integrated Check Valve 1. 5" FNPT Connection Mazzei OEM Part The Mazzei SPSA 1. 5 A is a dual function component that screens particulate from chemical feed lines while preventing reverse flow when the injector