Structural FRP tanks are the ideal choice for residential and light commercial water treatment applications that require flexibility. Structural FRP vessels improve your water treatment system and they are easy to handle and install. Structural FRP vessels are available in standard polyester or chemical-resistant vinylester construction depending on your needs. Structural uses FRP with polyethylene inner shell as a material of construction. Their standard color is natural, and other colors are available upon request. Structural FRP tanks have top opening with 2.5" -4.5" threaded, or 6" flange. Their maximum operating pressure is 150 psi ( 1 MPa) , and maximum operating temperature is 120° F ( 49° C) .