... standards) and 2L-5000L membranes(Natural Rubber, EPDM, Butyl etc.) for pressure and expansion tanks. Our brand Best Membrane conform to ... ROHS,PAHS,FDA.Our tanks can also be used at RO Water System.Brand:Best Tank Best MembraneHigh quality Hydrofor and Expansion ... Nautral rubber Membrane .Carbon Steel ,Stainless steel, Europe standard,working for high quality pump and heat water systemmodel:2L 5L 8L ...