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droppedgmc · 02-15-2012, 03:11 PM

the valves need air or preasure on the back side to keep them from opening. installing the check valve keeps the air from going back to the tank and keeps preasure on the up valve

02-15-2012, 03:11 PM	#5
droppedgmc Truck Enthusiast Join Date: Dec 2006 Location: Arlington, WA Posts: 1,346	Re: bags loose air when tank is drained??? the valves need air or preasure on the back side to keep them from opening. installing the check valve keeps the air from going back to the tank and keeps preasure on the up valve __________________ '85 swb