This product looks good until you assemble it from the individual parts. ALL NPT ports are over-drilled, preventing an effective seal. The worst thing is, if you tighten everything, you most likely will not hear the air coming out. Your compressor runs more often. This also applies to the dial. You can't tighten it enough so that it doesn't get caught in the sump bowl retaining ring. The solution is to use a plumber's gasket and then install a dial extender to place it far enough away to not interfere with the retaining ring that the NPT cup has been around for a long time. How come the manufacturer of this product doesn't know how to handle NPT? Lack of serious production requirements, ignorance of practice and lack of quality control (hence the price).
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