The block is large, well assembled, with thick hoses. It accepts a standard 1/4" MNPT host. I screw in my own quick connector (with teflon tape) and there is no leak. However, the trigger is broken on arrival. As soon as I hooked it up to the tire valve, this started Device leaking air (from the tire). There is no pressure on the trigger mechanism. Not enough air is coming from the back of the device behind the pressure gauge. This makes the gauge reading much lower than the actual pressure. When I pull the trigger all the way, Air gets into the tire and the leak stops. So it looks like a faulty trigger that always blows air out of the tire, but not a faulty hose connection. Returning this item to Revain. Hope you have better luck.