We offer ball valves for various uses such as manual drains, controls, and line shut-off. These valves are all PTFE-sealed and are compatible with all fuels. Our standard port valves have a port in the ball which is 65% as large as the pipe size. For example, a 1” standard port ball valve has a port size of about ⅝”. For added safety, you may wish to have a valve which will close if it is not held in the open position.