I have been using these valves for about 4-5 months now and had nothing but trouble with leaks. I have 2-1 inch valves and 1-3/4 inch valve. All of them have trouble leaking. I have even gone to the lengths of taking them apart and wrapping teflon tape around the thread around the manual pressure adjustment and checked for debris that may have been clogging the valves up but nothing helps. I do not recommend these valves in my opinion, but I cannot think of any other reason they could be leaking.