21 gallon, 8 x 16 x 42, ABS fresh water tank. The only solvent weldable water tank – add fittings anywhere. Light-weight, completely algae-free ABS plastic. Tasteless, odorless and non-toxic. Meets strict FDA specifications. Will never rust or corrode. One piece extruded construction eliminates the possibility of leakage. Baffled every 18 inches for surge control. Easily installed, universal design. Supplied with 3/8″ threaded, fitting inserts, three on each end.