To my experience nothing beats "vaseline" as a cheap and available source of O-ring maintenance grease. I don't know if vaseline is a trade name or actual product. It is used for medicin type lubrication also. Doesn't dissolve in water. Dirk _______________________________________________ Aquatic-Plants mailing list Aquatic-Plants at actwin_com http://www.actwin.com/mailman/listinfo/aquatic-plants