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Old 02-26-2011, 06:35 AM
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champaign777 champaign777 is offline
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Mein Auto: 2003 530 Sport Twins
Originally Posted by pleiades View Post
As noted in an earlier post, my new DISA O-ring is 50 mm I.D. and 3.2 mm thick.

I replaced the old one a couple days ago and it measures exactly the same.

I noticed when removing and re-installing the DISA unit, there was resistance both ways, presumably because the O-ring is meant to be a tight fit.

Those red ones look quite thin. Be sure to measure your old O-ring once you get it out.

My old one still seems usable by the way; not hardened or cracked/shrunken at all.
if you will squeeze it more it can be even 1MM

I double check it is 3.5MM and not 3.2 or 3.1 whatever

DISA O-RING 50mm x 3.5mm (BMW P/N: 11617504543), green


Last edited by champaign777; 02-26-2011 at 06:42 AM.
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