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Be glad one does not work with Jap pipe and whitworth pipe fittings…
I am not a professional Plumber, however I've been doing my own home plumbing all my adult life. When I plumbed up my whole house water filtration system I had lots of trouble getting the Chinese made Unions to seal. Long story short and after unsuccessfully trying different Chinese Unions, I went to a real plumbing supply store and bought Unions made in Italy, put them on and they sealed up tight. NO MORE Chinese fittings or valves from H-D !! Now I only buy the important parts and fittings from a plumbing supply Co.
I have found that Blue Monster brand Pipe Dope and Teflon Tape are even better than Hercules brand. Their stuff is the best I've found!
Silicone seal is like duct tape- many uses! Getting the threads cleaned up probably helped a lot. Good that you're (very nearly) leak freeThanks to everyone for all the ideas and recommendations. Here's the outcome:
Went back over yesterday to try and finish. Took everything apart, took steel pipe nipples and chased the threads in the pump body until they were clean and clear. Brushed and scrubbed all the male threads on the pipes. Wrapped the threads with 3/4" blue heavy duty teflon tape 4 full turns.
Applied two small beads of clear silicone sealant on top of the teflon tape. Spun the fittings until firm hand tight. Tightened 1 full turn more.
Waited one hour for the silicone to cure a bit, then fired up and inspected.
Two of the three are leak free. The last one has a TINY leak, one drop every 2-3 minutes. I believe the solids in the well water will plug this in a few days.
Thanks again to all. Lessons learned - you get what you pay for, you can pay me now or pay me a lot more later.