All thermoplastic insert fittings shall be produced by Spears® manufacturing company from PVC type I, cell classification 12454 meeting ASTM standard D1784, and shall be manufactured according to D2609 for use with polyethylene pipe produced to ASTM D 2239. All insert fittings shall be certified by NSF® international for use in potable water service. Spears® Adapter, Standard, Fitting/Connector Type: Adapter, 3/4 in Nominal, Insert x Spigot, 2-23/32 in Length, SCH 40/STD, Molded, PVC, White, Domestic