... % 2.GPD:1000 3. BW, LP,XLE,TW series optional reverse osmosis membrane water treatment filter specificationN.W/CM(KG)G ... in the period of storage ,installation and normal function .when install ,please use pure water or glycerin if lube is needed ... .5inches ,40 series 4.0inches and 80 series 8.0inches . reverse osmosis membrane water treatment filter