Two inch by two inch threaded/slip High-Temp Plumbing Union (2 PACK). Perfect for Heaters, pumps, filters and all 2" Pool Equipment. One end is threaded to fit both the inlet and outlet ends of your new pump or filter, with a tailpiece on the other end fitted to be plumbed in to your piping on your pool system. Wonderful to add in for plumbing, so that any future repairs or plumbing fixes can be made instantly.