Massachusetts-based Watts Regulator introduces the RO-5M One Piece Manifold Under Sink Reverse Osmosis System. The patent pending manifold system provides seamless water path by eliminating 17 of the fittings and connections required by most standard RO systems. RO-5M features five stages of filtration and is highly effective in reducing arsenic, lead, copper, barium, nitrite, nitrate, chlorine, bad tastes, odors and other contaminants. It comes NSF Standard 58 tested and certified, as well as with an air gap faucet.