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Aftre a few months tighten up the for bolts. I was up on roof and noticed a little drop in pressure. Wen I got down to the truck it looked like there was a crack in it. Think god I had more than I needed. Got home took it off and couldn't see a crack. I tightened the 4 nuts and reistalled it and Wallla! It now works. No leaks.So check them their bolts regularly....