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If they are butterflying you need to replace them. They can come apart and a check ball gets stuck in a line and causes issues. It is just a half inch ball valve from any hardware store. That is just normal off the wet tank to have those valves. Sent from my SM-G935P using Tapatalk

Thats standard secondary and primary shut off valves . They also tend to butterfly effect when they go bad. With pressure going thru they will fill and shut, fill and shut then show open. Make sure they arent loose Sent from my SM-G935P using Tapatalk

Top hose goes to the top of the treadle valve the cotton jacket hose on the primary tank the lower one goes to the 3rd connection from the top NOT counting the one with the fan hookup. Should be directly below that hookup. Its not a special socket. You take a flathead screwdriver insert it...

If you don't have air at the firewall end of that hose but do at the tank end then its collapsed maybe. Its 1/2" hose. It comes from the tank under the bottom of the cab to that fitting on the treadle valve. Thats all. Be cheapest to pull the line and find the obstruction and get two reusable...

The #8 jic line with the 90 on it that supplies that air to that fitting comes from the top passengers side tank with a #8 on it. It is cotton jacketed. That supply has no check valve. Pull it off and see if you have air out of the tank. Sent from my SM-G935P using Tapatalk