I did switch out the fittings to standard (same as ARB) and added a pressure switch (same as ARB).Did you have change the fittings to use your fill system? Reviews mentioned they use proprietary sized fittings. I have the ARB Twin in the portable box but I was thinking about picking one of these up to carry every day and keep the larger ARB for trips.It's from Smittybilt. They offer two and I have the larger of the two. Airs all 4 of my 37s at the same time just fine.
I believe it's $170 and the only thing else that out performs it is the ARB dual for $600. At least from what I've seen.
You don’t have to do any of that though for the 4 tire inflation kits. They usually offer the kits with a smitty fitting if you want.