Just Like my previous post, this post will also be about connector but this time we will be talking about bulkhead connectors.
They’re a kind of coupler, which passes pipe(s)/cable(s) through a bulkhead, as such they got two connection (sets) one for each side of the bulkhead
To ease making the hole they’re usually cylindrical in shape, with a nut/thread at both ends for securing the connections to the connection. They’ve then got a flange/securing nut to hold the bulkhead connection in place through the bulkhead
Sometimes there’s a single pin/socket/pipe through the connection, sometimes there are many.
here’s some which could be used to allow a muti-wire cable to “pass” though a bulkhead.