Frp Pressure Vessel Specification: 1)Material:inner shell- ... We have our own factory to produce Pressure Tank, disc filter, reverse osmosis water treatment plant, multi valve system. ... valve, fleck valve, Runxin valve, Fobrite valve, FRP and stainless steel membrane housing, PVC bag filter, ... valve, fleck valve, Runxin valve, Fobrite valve, FRP and stainless steel membrane housing, PVC bag filter, ...