Asahi/America Type 21 ball Valves are pressure rated up to 230 psi for PVC, CPVC, PVDF. These valves have double O-ring seals on the stem for added protection. It blocks in two directions, upstream and downstream, leaving full pressure on the opposite end of the valve. The True union design creates an easy installation and repairs without expanding the system. Body flats have been added to either side of the valve body where a wrench can be applied to prevent the valve body from turing when the Union Nuts are tightened.