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Molytec silicone based rubber and o'ring grease All pump lid and filter tank o'rings should be clean and greased. Also it is good for household taps and any other types of rubber o'rings that are effected by Petroleum based greases. TIP: A "dry"(ungreased) pump lid o'ring is more often than not responsible for pumps sucking air. One of the other most common reasons is a cracked pump lid.
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