Richard / Ben
Richard, after a quick read, the spark arrestor in the Australian carrier tank, is the mesh strainer, not the valve.
The non vented cap should not have the hole that has been drilled in it. I expect that it has been used on a tank with no vent pipes.
Ben the valve is in the cap, and is closed by the movement of the steel ball.
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Bluebell
Carrier Armoured O.P. No1 Mk3 W. T84991
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6.
Dodge WC55. 37mm Gun Motor Carriage M6
Jeep Mb #135668
So many questions....
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