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Stu:  The manifold drains on the IO-550 are no different than the ones for the TSIO version.  There are 2 drain manifolds to tee together and then run the line to the "sniffle" valve.  This provides a overboard drain when the engine is overprimed, and will leak any extra fuel from the intake valve area after shutdown, and the "sniffle" valve will close during operation in either high or low MAP.  Mike

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Please send your photos and drawings to marvkaye@olsusa.com.