Air brake valve replacement

Looking at the picture of the old valve again it looks like the fitting on the bottom left is the biggest. Therefore, match smallest line back to the smallest fitting, biggest line to biggest fitting. As for the remaining 2 fittings of the same size, the hose with the missing tube in the end should match up to the fitting with the tube and the hose with the tube stuck in the end should match to the last fitting without a tube. If everything matches up good, just transfer the lines over to the new valve.

 

Sounds like NM has a little better handle on that than me and I hope you followed that. When I look at your pictures the valve is cracked where the fittings screw in. That is from over tightening the fittings. Pipe thread is tapered and the more you screw it in the the more it expands the female threads. Plastic cannot stand that and cracks. If not on installation latter. I use thread tape and pipe dope, then just snug them up.
Cannot answer your question but when I come across a total design change like that sometimes I check with a different supplier.

 

The old valve, the two fittings on the left side of the picture, the plastic is cracked.