Review on Brass Control Device - Female Threaded Brass Check Valve by Mark Green

The valve works great. Use it to combine two compressors with different overhead psi relief valves. I need a higher CFM so I did a gay tube (Daddy with V check) and it works great. Even for HOURS there were no leaks or pressure changes from tank to tank. As I write this I am actually ordering a second one. They work! If you receive a broken one exchange/return and get a replacement as I work hard in my shop for many days and it just worked! Never had any problems and I'm hard on it.