The oil catch fittings require 3/8 ID hose. You can use silicone hoses, you can use vinyl (integrated braid hose that is qualified for gas/oil). Personally, if you,re not a slave to fashion, 3/8 ID Fuel line is about the best. Only comes in black though (as far as I know), and can be bought at any autoparts store (pep boys, western auto, auto zone etc.) As far as the catch filter itself, although its true that the water vapor condenser filters used for compressors have warnings about synthetic oil, these filters typically operate at MUCH HIGHER pressures. IMHO there really is no issue using the filters at the pressures that were talking here. Even if the filter was completely blocked there is not enough pressure to worry about exploding the catch vessel. I use a Greddy catch can Between the PCV valve and the intale manifold. Because(of the fact that it looks cool) & I bought it before the Idea was hatched to use compressor filters. I do have a compressor filter between the Air Intake tube and the fitting under the IC tube to the throttle body.
So the answer to your question is to use 3/8 ID hose that is qualified to be used with gas/oil whatever the construction you choose. And IMHO unless you want to pay $ 85 - $95 for a Greddy catch can, there are any number and sizes of compressor air line water vapor filters that can be used. Thay can cost from $11.95 to 25.95 for small and medium sizes respectivley. Home Depot carries a larger volume unit for $ 32.95 Hope this helps and as always Thats my $.02 [8D]
Alan
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