This is my mechanical prefilter material. I did some measuring to see how much PVC pipe it would take. I figured on how many elbows I would need. I brought my pump to my local hardware store to be sure tubing would fit the outflow of the pump. Because I planned to place this basket upside down in the bottom of the batting-filled prefilter to keep the batting from clogging the pipe.
Water comes in under pressure but leaves by gravity.
It's buried at the bottom of all that gravel and the little holes keep the gravel out of the pipe. An end-cap was not necessary. I later drilled a hole in the trickle-down filter box at the bottom and stuck in a PVC pipe with a valve to drain sump water. This proved not to be necessary. Drill with care.