The ball valves with built-in check valve BALLSTOP combine two devices in a single body: a ball shut-off valve and a check valve housed inside the ball itself. This dual function allows for quicker installation and a more compact device, which means less space required on the pipe. BALLSTOP valves are available in two versions for two different uses: the version with black plastic external ring for use in domestic water systems and the version with red external ring for heating systems.