I've replaced a lot of air line push connect fittings on trucks for leaking so no......
The o ring inside is replicable but I also always found nylon hose to be worn at the o ring side of the road DOT inspection fix one could always cut 1/4" off and shove it back in if one didn't have the...
I use the AESwave Utest terminal kit, the kit allows you feel the pin fitment as well as make jumper leads or adapters for male or female terminals for testing.
https://www.aeswave.com/products/utest-advanced-terminal-test-kit?srsltid=AfmBOoq1CuqX1T7SpFxlL-3kCe3qpzkCu-FS341vTGMmWdUTkDA-j5vx
Not all floor jacks are created equal, normally when you jack up a car it's to get under it and work on it pushing/pulling/twisting things makes it move on the jack, used on blacktop the jack can sink on on side etc.
Two things I've seen customers do, you need to avoid.
The first you seem to have avoided...don't cut the tank while cutting the panel out.
Do not screw a patch panel on without knowing if the screw is going to either go into the tank or rub on the tank after installed.
Are the ends(yokes) solid steel?
If they are you want to cut it at the welds clean it up then tap the new tube over the yoke and weld it there.
Some of that style shaft is foam filled to dampen harmonics makes them horrible to weld on.
That I do not have, the 150 amp service was installed in this house pre 1983 when I bought it as a upgrade from the original 1954 build.
The ground in my panel is connected to copper water line and the old bell tell wire is grounded to the same pipe....
The detached garage on the other hand has...
That's what I've always thought too but the Comcast installers say they are not allowed to touch any other "customer owned system or device". so they ground their cable demark with a ground rod.
Many years ago when I was in high school I worked for a company in West Chester Pa that repaired Schramm air compressors the early ones had flat head Ford V8's converted, 6 cylinder OHV Fords and IH 6 Cylinders converted to 3 running 3 compressing. They basically used what ever they could get...
Those fittings in that block look like what the cable company uses here for multiple hook ups in dwelling.
Unused and no longer needed, Now they all like to run there own ground rod into the ground.