87 357 air purge valve

I cannot seem to find the air purge valve anywhere. I'm wondering if it ever came with one from peterbilt in 87 or not. Only thing I did find was this funky looking valve I guess is what it would be right near the 1st tank out of compressor with like 4 lines coming out of it and what appears to be like a spitter valve but it does nothing even putting 145 psi with shop air and key on. Any help would be greatly appreciated as I'm trying to cure the moisture in air tanks issue. My 88 w900 has a spitter on it and works and never have wet air tanks. The video I made was too long to upload by the way that shows what I'm talking about.

 

I picked up an ss1200 but dont have a clue how to hook it up. Came with no instructions lol. I'm guessing it would be wet line coming out of compressor, 1 signal line coming from governor and 1 outlet hose to tank? The valve I speak of that's on it now appears to have a blowdown on it but for some reason it doesnt do like my w900 does and spit every few minutes.

 

And the valve or whatever it is has 4 lines coming out of it. 1 appears to be running to one of the r14 valves its 1/4" plastic line. Another line appears to be 3/8 plastic going who knows where. Hard to find #### with a dumpbed in the way.

 

Let me see if it will let me upload this 20 second video

Do you have an email I can send the video to? The forum says its too long of a video but its only maybe 20 seconds long.