They're all the same size. The Apollo comes in blue, red, silver or black. The one I picked up was black, I'm happy with it since it will suit the engine bay.
BTW, you'll need some 12mm (internal diameter) silicone hose to plumb the crankcase breather line into the Apollo. There are also some 90deg 70mm silicone hoses on ebay with short leg lengths (50mm length) which will suit our engine bay perfectly.
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