The Betts SU25188MS is a 4-inch steel drain sump with removable studs designed for complete drainage and optimized flow on tank trailers. This sump provides solid, lightweight mounting for all styles and makes of valves with a bolt pattern in accordance with TTMA recommended practices. The mild steel construction includes zinc-plated steel studs and nuts as standard equipment. With a maximum allowable working pressure of 35 psi and minimum bursting pressure rated at 140 psi, this drain sump offers reliable performance for petroleum and chemical tank trailer applications.