... Without Base,*Vertical Tank, *Butyl Membrane,*1/4 inch NPT Stainless Steel Connection *With Polypropylene Liner BESTANK FIX MEMBRANE REVERSE ... membrane Reverse Osmosis tanks, water is between stainless steel connection tube, food-grade polypropylene liner and food-grade butly ... and also external environments .All tanks have stainless steel connection to provide hygienic standarts for potable water .To ...