Near Intersection of I-35 & I-90 Southern Mn. | I've had some posts about working with a Chinese battery powered flow meter. The problem is getting fittings to mate and seal with it. I attempted to use a Banjo Quick Coupler with NPT threads. This was an obvious mismatch both visually and by feel since I could only tighten the fitting about one revolution by hand.
I ordered an expensive quick coupler with the BPST threads online. It is poly and the flow meter is metal. It threads in nicely by hand and has a good feel to it. The threads appear to be straight and not tapered on either part. There is a flat surface in the female threads in the flow meter. I tried putting a common O-ring there. My thought was as the fitting was tightened in, the blunt end of the coupler would squeeze against the O-ring to complete the seal.
When I tightened the fitting with a Channel Lock, I fund that the O-ring just squeezed out and did not remain where I had intended. I removed the fitting, discarded the O-ring and used Rector Seal on the threads, covered with two layers of Teflon tape and another layer of Rector Seal. I tightened the fitting with the Channel lock. The fitting bottomed out as the two surfaces mated. I tried the flow meter under pressure with the transfer pump.
The connection is quite good but leaks very slightly. Although this would be tolerable, a perfect seal is desired.
Ron replied on a previous post about using J-B Weld. I have purchased some J-B Weld and out of frustration am planning on trying it. I will remove the fitting and remaining Teflon tape and try to clean up all surfaces as best I can and apply the J-B weld. I have no experience with J-B Weld although I've heard of it for several years. Any other advice or tricks to try before going the J-B Weld route? Any advice on cleaning up my parts so J-B Weld will have a good chance of success? I realize that if J-B Weld should work, the connection would be permanent.
My cheap Chinese flow meter is getting to be a bit more expensive than I intended. The description indicated NPT threads but that is not true.
Edited by tedbear 6/26/2025 06:53
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Ron..NE ILL..10/48 Chinese flow meter, J-B Weld
