Features. For Cold Water Only Do Not Use In a Dwelling. Listings NSF 14 and 61 National Sanitation Foundation for potable water services. ASTM D2609 Plastic Insert Fittings for Polyethylene PE Plastic Pipe. ASTM D1784 Rigid Poly Vinyl Chloride PVC Compounds and Chlorinated Poly Vinyl Chloride CPVC Compounds. Material Lasco PVC Insert Fittings are produced from PVC Type 1, Cell Classification 12454B. Do not use Lasco fittings for compressed air or gases. Do not test PVC piping systems with compressed air or gases. Do not use fittings with liquids not recommended by LascoSpecifications. Size 1.25 in.