- These PVC pressure fittings conform to:- ASTM D 2466 - Poly (Vinyl Chloride) (PVC) plastic pipe fittings, Schedule 40.- ASTM D 1784 - Rigid Poly (Vinyl Chloride) (PVC) Compounds and Chlorinated Poly (Vinyl Chloride) (CPVC) Compounds.- National Sanitation Foundation (NSF) Standard 61 and/or 14 plastic fittings for potable water.