I've got a low mileage oil catch can up for sale, probably only used for about 100kms or so. In the interior, there is a baffle to help filter oil from the vapours, kept in place via two circlips spanning the diameter of the inside. I've also inserted a metal scrubbie to increase the baffling, but this is easily removed if wanted; each end of the cylinder is easily removed, and a gasket helps seal. The whole thing is made from 1/4" aluminum so it's very heavy duty.
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$old!
li Arc