Wow, thanks. I really appreciate it. I will send some pics shortly.antique diver wrote: ↑Wed Dec 16, 2020 7:26 pmSounds like you have one of the old non-swivel gauges that have a smaller male thread on the gauge than the modern hoses have? If you want to send photos to help ID the gauge you can send to me by the email link shown as a small envelope below my avatar.
Even better, if you can get an accurate outside diameter measurement of the male threads I can look to see if I have one of those hoses left.
Thanks for the rupture disc washer tip-that beats chasing down a specialty cone washer.antique diver wrote: ↑Sun Dec 20, 2020 12:22 pmUpdate on tightening the original non-swiveling hoses to the older gauges: As I mentioned earlier the plastic housings on the old USD gauges pictured were of some concern when tightening the hose to the brass fitting that extends from the plastic case. I was tinkering with one yesterday and confirmed that a nylon washer of the right size can go into the female JIC type original hose end and effectively seal against the male end of the gauge connection with much less torque than is required with the metal-to-metal seal. That lessens the chance of cracking the plastic housing. The washer I used is the same as used under the 3/8" rupture disc of many Scuba valves, so is readily available.
I have often used this same trick with other JIC fittings of various sizes that were difficult to seal due to scratches or uneven/worn sealing surfaces. I normally use copper washers on the 6000 psi applications, and that works fine with less chance of extrusion than with the nylon washers at such high pressures. I think the copper washers would work quite well on the gauges too.
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