Threaded pipe connections ... like sink connections. Glued connections: PVC (polyvinyl chloride), CPVC (chlorinated polyvinyl chloride), and ABS (forget it — nobody knows how to pronounce ...

The current cap is just a standard PVC cap that I can find at Home Depot for 50 cents. However, none of them have 1/4" threaded holes. I am not mechanically inclined, so I do not know if I can ...