Let me correct myself. The petroleum jelly Eheim encloses with their 2028 Pro II is for lubricating the hoses for ease of placement on the barbs on the pump head side and the intake/return barbs. I don't believe it is for the O-Rings. Dave _______________________________________________ Aquatic-Plants mailing list Aquatic-Plants at actwin_com http://www.actwin.com/mailman/listinfo/aquatic-plants