Spent 3 hours trying to get this thing not to leak. Got a leak on the flow switch end, from the union. Not for the hose. Used no teflon tape, some teflon tape, alot of teflon tape. no difference. Tightened by hand, and then a little tighter, still no difference. Finally gave up after the 100th misquito bite. Any chance this is a defective O-ring?