Sanborn Coleman 031-0037 Check Valve is an inline backflow-prevention valve featuring a 3/8-inch compression inlet and a 1/2-inch male pipe thread (MPT) outlet. It provides one-way flow protection in piping systems, preventing reverse pressure from reaching pumps, fixtures, or downstream equipment. Also known as 031003-7, this model accommodates standard compression fittings on the inlet side and a 1/2" MPT outlet for reliable, compact installation in plumbing or hydraulic applications.
