NIBCO 429 Series PVC Pipe Fitting, Coupling, Schedule 40, 1" Slip Coupling for connecting two pipes with the same diameter in a straight run Slip openings for connecting to male unthreaded pipes or fitting PVC for corrosion resistance, high strength, and less weight than fittings made from metal Smooth interior finish for reduced friction and material buildup Meets specifications ASTM D2466 and D1784 for quality assurance