I'm back! Ok, here is what I need to do. I have two 5" black plastic pipes coming up level with my concrete basement floor. I had carpet layed recently and I want to cap these with something that looks better than a plastic cap. I found some bronze metal caps that screw into a 4" pipe and have a built in clean out plug (Jones Stephens Corp. part # D59-945). I assume I need to reduce this inside with something female threaded. The existing white plastic clean out plug is about 1 foot down inside of pipe. It is bowl shaped with 4 prongs sticking out on the inside. I need to remove this plug since the new cap has one built in and I won't be able to remove the old one when I need to. What's the trick? Special tool? Am I way off on these even being clean out plugs?