read all the other reviews, same here. Works great, made changing my trans oil easy. The air fitting is not a pipe thread but my replacement is, 3 wraps of Teflon tape and it only engages about 2 threads but was air tite. The pressure relief valve is at about 25 psi, says don't use more than 50 psi but pops off way lower, keep supply pressure at 35 and it works great. No instructions, if you are doing your own transmission work you will be able to figure out! the recover, supply knob seems to be backwards, mine was blur and when I turn the directions of the arrows on it to supply gear oil it was making bubbles, I turned it to recover (suction) and it pumped oil... don't be afraid to experiment!