The “Slip T” PVC fittings, also know as a TL or pass through tees, are commonly used in building PVC structures where you don’t want to compromise the strength of the pipe by cutting it. With no stops in the top of the Slip T, you can simply slide it onto the pipe where you want it. They also make good PVC pipe hinges. If you want to fix them permanently after they are set in place, they can be glued or put a self tapping screw through the fitting into the pipe. All outlets are non-threaded sockets and are compatible with furniture grade PVC pipe or standard PVC pipe from a hardware store.