This 1″ Sch 80 PVC Coupling (FNPT x FNPT) joins 2 pipes together in a straight line. a male adaptor, threaded pipe or pipe nipple connects to this part. Sch 80 PVC is robust and durable, perfect for commercial and industrial applications. Petram PVC has all the schedule 80 PVC and CPVC fittings and valves you need for your project.