... FRP tank for water treatment water softener,ion exchange,pretreatment system FRP tanksFRP tanks,operation ... C.4. FRP tank has upper and under openings, and flange connections, which can form ... have many different Models: 871-96126(upper and under openings and side openings), 2.5’’, 4’’, 6 ... ’’, 16’’, 18’’ flange.6. Accessories: upper and under distributor, black cock, multiport valves, central tube, ...