I thought I'd upload some of the best photos for this article in case it helps someone. The male quick disconnect (gauge end) is made of steel and has a one-way valve. While I believe this to be the most popular version of the quick connector for fuel gauges, my ABW gauge (made in the USA) fits slightly different shaped fittings (brass, no valve, slightly shorter). The other end, of course, mates with the standard large Shrader valve fitting found on the fuel rail of some cars (GM and others).
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