See all products of Ball valves with built-in check valves BALLSTOP, Ball valve with built-in check valve, female connections. BALLSTOP, Ball valve with built-in check valve, female connections. Lever handle. BALLSTOP, Ball valve with built-in check valve, male - female connections. BALLSTOP, Ball valve with built-in check valve, female - captive nut connection. BALLSTOP, Ball valve with built-in check valve, male - captive nut connection.