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Pilot for the Kozo Hiraoka Rio Grande K-27. Gauge: 89 mm (3-1/2"), scale: 1/10.27 (1' = 1.17").
The dimensions and the design base on Kozo's drawing (Live Steam Magazine Vol. 51, No. 2).(Edited)
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Air Brake Gladhand - 2.5" scale (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 40 PSI pressure.(Edited)