2013 MAN TGS Air Tank

HI All,
inside the chassis rails on my tgs there are 3 air tanks, but only two of them actually fill up with air.
The one that doesnt actually fill up doesnt have a drain plug so makes me think maybe it shouldn’t fill up?

Anyone know its purpose?

Cheers,
Nick

Second photo

Its got a voss air fitting in the bottom port, so all I can suggest is you follow the pipes and see where they go?

bowers340:
HI All,
inside the chassis rails on my tgs there are 3 air tanks, but only two of them actually fill up with air.
The one that doesnt actually fill up doesnt have a drain plug so makes me think maybe it shouldn’t fill up?

Anyone know its purpose?

Cheers,
Nick

It’s an air drier purge tank

AF1:

bowers340:
HI All,
inside the chassis rails on my tgs there are 3 air tanks, but only two of them actually fill up with air.
The one that doesnt actually fill up doesnt have a drain plug so makes me think maybe it shouldn’t fill up?

Anyone know its purpose?

Cheers,
Nick

It’s an air drier purge tank

Ok cool thanks for that. Should it have a drain plug at the bottom then to let the crap out?

An air drier purge tank !!! WTF.
What you purging the bloody titanic ?
So you need a 50 litre tank to purge a 5 litre air drier?
Another expert Jesus you listen to these clowns?