What are these things?

Even 2 seconds of air may burst the air bags. Until you know, GO SLOW!

ok okay! that threw me, thanks for clearing it up.

By the way, the supplemental air springs don't hold a whole lot of air. A spurt of a couple seconds will bring them up to pressure, and a few taps with a tire gauge or whatever will bring them down if needed.

Keep hold of those nice metal valve stem caps on them; the notched pointy end is a valve core remover/installer/tightener, and rather handy to have when you need one.

Thanks very much.

Yes standard air conn. Start out with about 50psi. Than adjust for ride and handling.

Thanks! Do those air fittings take just a regular schrader fitting?

1. is a 4 pin trailer plug and 2. is valve stems for air bags on the suspension.