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the pics are of my duece, 900 series valve and pedal is what i used. air packs and dryer are from nissan UD truck.

900 series treadle valve on firewall

problem is that most people simply aren't up to doing the work required. most probably don't even check for rusted lines or rotten hoses and if they have to add fluid every few months, that's ok with them. the people on the forum who can do a dual upgrade mostly already have. i put dual circuit...