This 1″ Sch 80 CPVC Coupling (FNPT x FNPT) joins 2 pipes together in a straight line. a male adaptor, threaded pipe or pipe nipple connects to this part. CPVC is a higher temperature version of PVC and has better chemical resistances. Petram PVC has all the schedule 80 PVC and CPVC fittings and valves you need for your project.