What is this air valve called?

If I ain't mistaken it's called an Air Protection Manifold. All it does is let the air lines pass safely through the firewall with out rubbing holes in them. In other words it's metal tubes with plastic lines hooked on both sides. The wire harness though beside it has nothing to do with the air lines. They are being protected too as they pass through the firewall.

Pass through the firewall thingamajig is a good name, lol.

Write it up as pink air line passing through firewall is leaking or something similar.

 

on some European models this manyfold is made of aluminium with brass tubes inside

 

dealer wiil tell you to replace the whole thing and its not cheap, instead just pull it out with pliers and replace the O-ring inside, that's what I just did on mine.

 

You must be an OO. Just replace the line as it looks short and old from the pic. If you have some excess then just cut the end off. Then replace the ferrel that slides over the hose and it should reseal. If you have a hard time finding one Lowes and Home Depot carry them.

 

These guys sound spot on, I would highly recommend this procedure, It sounds like it would fix it and would be very cheap.(Or cheaper then the dealer) I hope this helps.

 

to pull out tube u need special tool. Tool is like made of steel tube with thin walls cut in two pices with handle to punch it into fitting and ulock air line

But really these fittings are single use. So we use to drill holes and add fittings with cone threads, looks terrible (especially for DOT inspector) but works fine))) LOL

 

http://www.thetruckersreport.com/tr...replace-05-volvo-firewall-airline-wiring.html

I used to have the same problem. The whole plastic thing developed some hairline cracks and the orings were hardened and leaking also due to age. I just replaced the whole thing. The part costed 110 something.

It is easy to do it yourself. Finding the right size orings is difficult and don't recommend just replacing the o ring because the whole plastic piece is likely to have some hairline cracks that you can't see. Trust me, you can do it in 2 or 3 hours max. Most the info you need is in the post.