Thomas Compressor 405ADC38

[dentmac]

In the 450 ,as you know, there is no slide air seal. The suspension simply does not leak, but there is some leaking in the slide out valves which causes the little thomas to cycle. So if the Thomas is plumbed to power the toilet only (with an emerg. valve to the rest of the accessory system) it will rarely run.
To move the slides-- air up with the 120 before unplugging or use the engine air.
In the 450, you need to shut off the "slide " breaker when dry camping anyway.