Brass ball valves work at 600 psi in 14 thru 2, and work at 400 psi in 3 and 4 sizes. Brass ball valves are stocked up to 4 in both locations. High pressure steel ball valves are also stocked in both locations in 14 thru 1 14. The high pressure steel ball valves work at 5, 000 psi or more. If you need stainless steel or 3-way ball valves, check valves, or anything similar, please inquire and we can special order any of these items for you.