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Quite correct, the sniffle valve is not a part of the IO-550 installation as delivered, but we of course can install one.  I would think that if it is a required item for the engine that TCM would provide it.  I didn't like running without the sniffle, since during priming and after shut-down a substantial amount of fuel can drain out of the lines, and a restrictor fitting may not allow enough drainage, fast enough.  Mike

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