Reverse Osmosis Membrane housing accepts all 12" standard size membranes and are manufactured using the highest quality NSF listed, FDA grade polyproylene, WQA validated. The RO Membrane Housing Inlet/Outlet ports are  built-in John Guest® fittings. The Drain (brine) and Product (permeate) ports are equipped with (2) 90°outlets with built-in John Guest® fittings, eliminating the need for additional elbows. 

Brine port requires an external flow control (flow restrictor) that is sized to the membrane capacity, typically a 3:1 ratio (located off center of the 2 outlet double ends) Permeate (RO or Product water) port requires an external inline check valve (located center port of the 2 outlet double ends).    
Use O-Ring # OR-2 for EH series housings.