Originally Posted by timbrass
My question is whether it is possible to use a single tank and if so which hoses can be connected. In other words what valves are there between the 3 chambers. I am happy to manually drain frequently.
Possible? Yes, if you're out in the wild and are in a need to move it or you'll die scenario.
Legal or recommended? Absolutely not
The air system on your bus is set up to have 2 seperate/protected systems. That's for safety, and to change from that would be illegal in all 50 states. I'm not sure in the uk, but I highly doubt they'd have different legislation on something like that.
If the single 3 compartment tank is so expensive and the individual tank is cheap, you can run 3 individual tanks and be okay. It's just you'll have more fittings, tubing, and room wasted under the bus.
And honestly, if you don't understand how the air system is supposed to function, I really wouldn't recommend that you try and create a system from scratch. It leaves the possibility for a lot to be overlooked, which could be dangerous.