Do you Mean PVC Pipe?
I've never Used PVC pipe for cichlids as i do not keep them myself. But recently i did use it to make some caves for my new clown loaches. Just make sure to remove all the burs after cutting it to the proper lengthen. Then use some sand paper to smooth out and rough edges so the fish are not injured by it.
Lastly, clean them good in hot water and place it in your tank. Hide it with plants or rocks if you wish.
As i posted before, after going to all that trouble for my clown loaches, they decided they liked wedgeing themselves between the pipe and the red slate rather than sleeping IN the pipe.