A Tool For Line Blends / Currie Grids in Equipment Use and Repair Posted December 23, 2015 · Report reply I hadn't thought of using an outer cover. It'll be faster than having plugs if the fit is right and there's no friction, but I suspect this will be hard to achieve. Shouldn't be too hard, really. If you can't get anything else to work, get PVC couplings that fit your pipe - the outside diameter of your pipe will match the inside diameter of the coupling. Cut the coupling in half, across the diameter - you may need to grind down the ridge that goes around the center on the inside (the bit that's there to stop you pushing the coupling too far onto one side of your joint.) That piece should fit your PVC like a glove. Rig up a set of slides with some epoxy and whatever material seems like it would work. If you have too much friction, well, a Dremel with a sanding pad can be your best friend sometimes. Just DON'T forget a dust mask and eye protection anytime you're making PVC dust fly around. That stuff is nasty. Another option: get the next size up from your main PVC size, cut out your cover piece, then fix on a piece of firm foam (something like this, cut to fit) to make up for the diameter difference. Rig with slides as above. Doing it this way would let you slide it lengthwise, if you prefer, though you'd probably have to be prepared to replace the foam fairly regularly, since I don't think that stuff cleans all that well. It is fairly cheap, though, per square inch. Hell, if none of that works, you could probably figure out a hinge/latch system. It would be messier, for sure, but you wouldn't have to worry about friction. I just have mental images of trying to take out an oil plug (in a car) without threads when you talk about plugging the hole. And I've never managed to open one of those salt shakers with a plug without getting salt everywhere.