I've never even seen those things but they look as if they would provide an excellent seal.
Me neither, just found them while looking for a source of beveled washers on Amazon as it's become my new go-to for almost anything.
On a related note, I noticed an
old thread on NH where BuffDaddy was using the same 5/8L beveled washer I use for a front seal as the rear seal on an air tank using a 1/4" "pin" just like mine does. I had noticed they were a snug fit on the threaded portion of the bolt that I used, but I had never slid it further down. This basically means that I could "mirror" my front seal using the beveled washer and o-ring to the back of my EPVAT, thus eliminating the need for the brass bits on the back, reducing both size and price of the entire tank/valve assembly. It's almost ironic because I had begun sourcing polypropylene 1/2" x 1/8" adapters to replace most of the brass, but this is a much cheaper solution.
Now, for the unrelated note, I found and bought a
fairly cheap bike pump that I think has the potential to be versatile enough to be useful. The handle is threaded on meaning I just need to find the thread size and I can use whatever I want for it, and the top has a cap, so if the handle rod seems too flimsy, it should be fairly easy to replace. I guarantee that the tube unscrews from that base, so I should be able to just glue it into a bushing and have connectivity options. Lastly, even without needing to modify it, you have a decently long hose that can just connect to either schrader or presta valves, 1/4" threaded versions of which are readily available, meaning this should be able to just be zip-tied onto anything and work with minimal effort.
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