It is likely you don't have leaks at the valve body because the hose end goes into a swivel adapter. If you look at the inside of the adapter and the end of the hose fitting you will see they have a seating arrangement where they meet. They seal internally, not by the threads. The adapters should be NPST (National Pipe Straight Thread), the threads are not tapered but are the same pitch as NPT (National Pipe Tapered Thread). NPT seals on the threads. The hose end threads are likely tapered to work with NPT but as both the hose end fitting and coupling you are using are steel, they are not conforming to each other as easily and are not sealing well in the threads. You will need to use thread sealant of some type to stop the seeping. Loctite 545 is one I have used in industrial applications on steel fittings. Loctite TIGHT is another good one. Everyone will have the pipe sealant and/or tape they think is best. My thoughts are you will need something for tape and/or sealant where you used the couplings between hoses. JMHO.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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