Roto-molded, one piece construction for ultimate durability. (Optional) 3 hookup fittings and 1 fill fitting preinstalled (on the front face of the diagram) for convenience of use in any orientation. 39" x 16" x 8", 20 Gallon. - Tank Only or with three corner placement fittings in your choice of 3/8" or 1/2" and one 1-1/4" filler boss.