Harbor Freight has a pressure tester at least as nice as the parts store if you get tired of having to rent tools and have room in the tool box. Mine was leaking from the 2" hose - bypass hose I think.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.