Pvc, cementing after I dry the pipes offnp, just check to make sure u can get the tubing on and off the pump and not mess up the other plumbing (this was my whole issue), its hard to tell the head room under the sump to tell how much room you are working with. Dont want a flood happening or anything, when you are settled on the position of everything, see if the check valve is pvc and pvc cement the fittings just in case