FORMUFIT 3/4 in. Slip Sling Tee Fittings in Blue lets you create rotating mechanisms from PVC pipe. This Slip Tee connects a PVC pipe into the socket, while another 3/4" PVC pipe is allowed to slip through perpendicularly, creating a hinged apparatus. There are two sockets, one for inserting a static pipe and another pass-through for a moveable pipe segment.