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Thomas Compressor puzzled part

I'm replacing my vibration isolators on the aux air compressor, along with the Square D pressure switch. I purchased what I believe is the correct part (9013FHG2J27X) but the new switch has an air port, unlike the original. So is this not the correct part or is there something I'm missing?
Pics included
2001 36' U320 Build 5901
2001 LX470

Re: Thomas Compressor puzzled part

Reply #1 –
Looks like the one you got has an unloader.  It has cut in pressure of 80 psi and cut out of 100 psi.  Those pressures are low for my coach but these units have where you can change the cut in and the cut out pressures.  It will work, but if not too much trouble you could return. 
2014 ih45  (4th Foretravel owned)
 1997 36' U295 Sold in 2020, owned for 19 years
  U240 36' Sold to insurance company after melting in garage fire
    33' Foretravel on Dodge Chassis  Sold very long time ago

Re: Thomas Compressor puzzled part

Reply #2 –
Looking at the Square D 9013 catalog  https://www.grainger.com/ec/pdf/6B452_2.pdf  page 22, the "X" at the end on the new part indicates a 2-way pressure relief valve, so they are not identical.

Learn every day, but especially from the experiences of others. It's cheaper!  - John C. Bogle

2000 U320 36' non-slide / WildEBeest Rescue
2003 U320