Thread: ZF 4HP22E O rings

11.5 x 2.5 mm

Cheers!

It’s either BS111 or BS112 - it won’t be metric.

That’s 11.11x2.62 or 12.2x2.62mm

Originally Posted by Tombie

It’s either BS111 or BS112 - it won’t be metric.

That’s 11.11x2.62 or 12.2x2.62mm

Thanks Mike, that surprises me but I'll try and get one of each.

Originally Posted by rick130

Thanks Mike, that surprises me but I'll try and get one of each.

German “metric” is usually just Imperial Sizing converted.

Go for Viton

I have ERR1594 spares in my garage and measured one with caliper when i saw your post hence my reply so might be some micrones difference but IMO even 11.5 x 2.5 orings should be up to the job

Originally Posted by sierrafery

I have ERR1594 spares in my garage and measured one with caliper when i saw your post hence my reply so might be some micrones difference but IMO even 11.5 x 2.5 orings should be up to the job

They don’t make them

100% on the Viton.

If I hadn't lost my massive HNBR auto AC kit I'm sure there would've been one in there that fitted, and HNBR is pretty bloody good for temp and mineral/PAG/POE/PAO oil resistance too.