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Some were galvanize under vinyl, personal experience.

If it's galvanize under the vinyl you got lucky, all weren't. I would only remove it if it interferes with n it hydroed.

Sounds more like vinyl coated than paint. They were hard to read.

Try here. https://www.lowyusa.com/product-category/metal-fasteners/d-rings/

Sold as a weightbelt buckle but were also used on backpacks. Healthways used them on backpacks.

Keep in mind the J valve is not an on one second and off the next operation. It starts to restrict flow before it shuts off and it may not ever shut off completely. A better test is to determine at what pressure it starts restricting inhalation.

You will find it here along with a lot of others. It seem t has to be requested now, it was available directly. I think it might be in Vintage Double Hose manuals. https://aqualung.com/militaryandprofessional/techlib.shtml

Or 1/2 of a flat. 30 degrees. very easily observable.

Considering I have been known to dive using homemade regulator parts this price thing is kind of pointless. Any regulator from a major brand is more than just good enough for recreational and most other types of diving.

Try a glass on milk before bed. The tryptophan in milk promotes sleep, works for me. https://www.sleep.org/what-is-tryptophan/

For the record a JIC flare is 37 degrees, an SAE is 45 degrees. Either will screw on the other but not seal correctly.

I built my hose with a tank filler on one end a quick connect on the other. I have a quick connect on my compressor outlet a a quick connect on another tank fill so it serves either as a fill whip or transfill hose.

For me who started diving in 1957 it's the dive computer hands down.

From the Op's picture I will say it is a JIC, either a -2 or a -3. A 1/4" NPT hose end can use an adapter to JIC female or male and may be the best option as it will allow connections using different adapters. I use braided stainless steel teflon lined hose with JIC ends.

I know someone who said his tinnitus disappeared after the receiving the vaccine. As most said just ignore it. After years of riding motorcycles with open exhaust, flying as crew in reciprocating engine aircraft in the Navy, shooting and 33 years working in a noisy environment I have it. It...

Any industrial hose supplier should be able to make a hose. It is probably just old and leaking where the fitting is crimped on the hose. I say old because I notice the outer jacket has deteriorated and fallen off.

Nuff said. I bought my compressor in 1969, it's still running, best investment I ever made.

For some no amount of dives will make them competent, fact of life.

Bolt threads and pipe threads are measured differently, Pipe is measured by inner diameter so the thread which is on the outside is larger than the stated size of the pipe. Bolts are measured by outer diameter and more closely represent the actual diameter of the thread.

So I guess flying a single engine, single seat aircraft with just an altimeter, air speed indicator and gyro horizon, no parachute, radio no GPS is out of the question.