Cummins ISX 871 two piston air compressor?

[dhirocz]

The investment was minimal. Maybe $30 total.

I keep a breaker bar if I need to go manual. The air just speeds up the process... my jack also uses air or raises manually... But for me, it still allows me to air offload tanks as a last resort.

It is also allows me to hook up to shop air to keep the truck pressurized while looking for air leaks.

To each his own. It's saved my ass a couple times. Also used the air from that line to *ahem* force fuel back to the primary tank when my levelling valve failed on me in MD once. I try to keep an assortment of useful items in the truck, like hose and hose pinch pliers and plugs, in case these things happen.