Superior Choice for Use with Polyethylene Pipe Spears PVC Insert Fittings are designed for use with either ASTM D 2104 Schedule 40 or D 2239 SIDR pressure rated polyethylene pipe. Chemical and corrosion resistant, rigid PVC barbed inserts provide excellent grip with polyethylene materials. Conform to ASTM D 2609 Spears Insert Fittings are manufactured from high quality PVC materials to meet or exceed the applicable requirements of ASTM D 2609, Standard Specification for Plastic Insert Fittings for Polyethylene (PE) Plastic Pipe Twist Lock Insert Adapter with Built-in Clamping Special Insert Fittings design uses built-in lock ring for easy connection without clamps to Polyethylene (PE) Plastic Pipe used with standard Insert Fittings NSF Certified for Use with Potable Water Spears Insert Fittings are tested and Certified by the NSF International for use in potable water systems.