G'day Benny_IIA, those black rubber fittings are the same standard fittings as supplied originally on the Isuzu Landy, they have the same volumetric efficiency as the 3inch tube they are attached to, so more than enough air!
 
Hi Peter, a bit further south on the Starke-Wakooka track, east of Nivens Hut, that pic was on the track into Cape Melville, some the creek crossings where up to my waist sitting in the Landy, but none of us were prepared to risk getting out for a pic, due to the hungry looking large lizards we spotted close to most of the water holes. Mind you I was keen to put the shotgun to good use, but for some reason, neither of my mates were

. Someones gotta drive, and shoot


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