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Yes @wheelspinner I am sure I will need some parts. I will PM you with a list of what I think I might need.

thanks @Simp5782 that will be a good start. much appreciated.

Yup ... looks like this might work ... it's the first one I saw where it says "for Water, Oil and inert Gas" which surprised me as I assumed it might not be air-tight when air-brake system is pressurized. 400Psi so I am quite sure it will work (2 on order now).

Yes Derrick .. I tried both ways having yellow (parking) pulled with red (trailer) pushed both pulled and both released ... no matter what I tried I could not get air to the spot from where I removed this valve. I assume the motorpool in Hawaii did something since the union is rusted clean...

My initial thought was/is to simply connect directly to where I removed this valve and place glad-hand with on/off valve at the end of the 5th wheel hose. BUT I don't know why I am not getting air to the line from where I removed this 3way isolator valve...

My first post to the Forum; I'm a helo driver (so I can read a TM but need pictures) but not a truck guy :lol: so likely to get a few things wrong. ... been digging through the excellent sticky at https://www.steelsoldiers.com/showthread.php?140345-Air-Brake-Info-and-Troubleshooting and other...