WK63211 Heat fusion joining of polypropylene (PP) pipe and fittings
WK85672 Heat Butt-Fusion Joining of Very Thick Wall (>2-inches) Bi-modal High Density Polyethylene Pipe and Fittings for Industrial and Municipal Applications.
WK81507 Standard Specification for
Adhesives for Joining Poly(Vinyl Chloride) (PVC) Plastic DWV (Drain, Waste, & Vent) Pipe and Fittings1