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Air Brake Gladhand - 2.5" scale, REVISED VERSION
(as used on narrow gauge rolling stock).
Usable for vacuum, compressed air or liquid.
They hold 80 PSI with no leaks and the O-ring stays in place while uncoupling them till 25 PSI pressure (the pressure test was done, without using glue to fit the O-ring).
Use O-Ring (Dash 108, 50° Shore A, McMaster-Carr part number 1173N108) for sealing.
Nipple accept 5/16" ID flexible rubber hose.