Reverse Osmosis Membrane Housing KitUSAGE: Houses the Reverse Osmosis Membrane on your reverse osmosis system. DESCRIPTION: This replacement reverse osmosis membrane housing which houses your reverse osmosis membrane on your reverse osmosis system. Comes with brand new fittings to connect your RO Water Pipe to the housing and also a spanner wrench to tighten. One of the fittings has a non return insert inside, this is the one that goes on the RO Membrane that brings the water to the