Max Water 2521 Stainless Steel Reverse Osmosis Commercial Membrane Housing. Commercial Stainless Steel 2.5″ x 21″ Membrane pressure vessel housing.Max Working pressure: 250 psi.Feed/concentrate Connection: 3/8″ Feed and Drain Ports (FNPT)Box contains unit, double O-ring end port caps stainless clamps, and stainless hardware and brackets included. Open box item. Item appears in new like condition and not used. Original cardboard box has damage, labels removed leaving glue, torn or dented corners, or parts of the box cut or removed. May have minor blemishes from being removed from original packing and from shipping. Shipped in box shown. SKU T3 JK443 3892D 25474134