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Well I know I am digging an old thread up but I did not want to start a new one when there was already some information started on the ISRI seat. Looks like the seats posted on here are the same as mine, they just have the lumbar controls on the side of the seat and then the chrome six way power seat controls. The controls in mine were taken apart or came apart, I know I found a post by my previous owner about it leaking. So in my search I came across this parts manual that shows what appears to be the same type of seat as mine. So I am trying to confirm that the supply air line for the seat must have had a T to feed the lumbar and to also feed the seat airbag? My line was disintegrating and I had to put a new 1/4" line on it. So the other thing that I worked out was that I needed to convert to the 4mm line to connect the lumbar controls. There was nothing that would convert from 1/4" tubing to 4mm tubing but I found an air fitting that went from 1/4" tubing to 5/32" tubing, and 5/32" tubing is very close to 4mm. I ordered the adapters and the tubing and it worked fairly good. I had to heat the end of the 5/32" tubing just a little bit with a lighter to slip it on the lumber control. But it worked a treat. Now I need to try to get the seat raised up so I can get under to replace the tubing going to the airbag, its also disintegrating.

Oh also I bought a pack of those 1/4" to 5/32" fittings along with 35' of 5/32" tubing, so if someone else wants some I can send it along for the postage or if you are around Tampa, Florida or the next rally I would be more than happy supply them to those who need them.

So does anyone know if there was a T fitting to supply both the lumber the airbag? What controls the airbag pressure? I know there was talk about a regulator somewhere, I guess I need to look around and see if I can trace out the airline and see where it goes. 

Here is the parts manual I found:

ISRI Service Parts List.pdf Size: 910.18 KB  Downloads: 7