See all products of Standard 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 - nut connection. BALLSTOP, Ball valve with built-in check valve, male - nut connection.