Auxiliary heater retrofit question

[silverbullet]

Can anyone tell me the size of the holes that pass through the firewall for the aux heater feed/return?

The hoses are different sizes, ETKA lists two part numbers for the grommets but only gives info on one and that just says "27"

I have the smaller grommet but not the larger one. Everything else in hand.

I know where they need to be popped through, this is last knockings before the van finally makes a move to the restorer (Monday!)so I am clearing up the odds'n'sods jobs.

Ta, Ian

[multisi]

Hoses should be the same size, 22mm. Just measured the holes in my van with grommets in place and the hole in the metal looks about 27mm . The vw diagram parts list says you need two of them, part number 253265598 . They do not seem to have a tight fit around the pipes, maybe wear on mine , should be a better fit , gases could get in .

[Oldiebut goodie]

Hoses/holes were the same size on mine when I took them out also.