Aquarium-safe, non-petroleum lubricant for use on all O-Rings, Use Pentair Aquatic silicone lubricant on rubber seals, gaskets, and O-Rings where binding and corrosion occur, Lubricates threaded connecting parts on aquarium equipment and plumbing parts, Silicone Lubricant extends the life of rubber parts to help prevent leaks due to brittle or cracked O-Rings and seals, 3/4 oz, SKU: RPS21028