I made these push-in o-ringed fittings from Delrin round stock for an evac system, makes it easy to put oil in the engine...
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Separator can was made from glued together ABS pipe...
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The hoses enter the can on a tangent, with vacuum pump drawing from the bottom thru a center stand-pipe. The plan was to work like a cyclone separator, any oil drops entering the can hit the outside wall and swirl around the stand pipe, more likely to drop to the bottom of the outer chamber than make their way to the center/top of the stand-pipe.
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Eventually eliminated the vacuum pump and just added a pcv valve to the top of the can to be used as the vacuum source.
Grant