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New o-rings should be lubricated with silicone lubricant before installing. You can also extend the life of your o-rings by applying lubricant every time you open up your filter for maintenance.
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AquaTop O-Ring Silicone Lubricant AquaTop O-Ring Silicone Lubricant

Product Code: RAT01525
AquaTop O-Ring Silicone Lubricant is an aquarium-safe, silicone-based lubricant for all aquarium filter housings that use o-rings, gaskets or seals. Provides lasting protection for all o-rings and seals to help prevent water leaks. A low cost lubricating solution for water filter housing o-rings, submersible pumps, hoses, sprayers, plumbing projects, and many other applications. Protect your o-rings from drying out or cracking. Works on all brands of aquarium or pond filter housings. Product comes in a resealable, waterproof plastic container. 1/2 oz.

Our Price: $5.99
Pentair Aquatics Silicone O-Ring Lubricant Lifegard Aquatics Silicone O-Ring Lubricant

Product Code: RRL00462
Lifegard Aquatics Silicone O-Ring Lubricant. 3/4 oz.

Our Price: $6.62
Magnum Silicone Lubricant & Sealant PR1590 Marineland H.O.T. Magnum Silicone Lubricant & Sealant (PR1590)

Product Code: RML15900
Replacement Marineland H.O.T. Magnum Silicone Lubricant & Sealant (Part #PR1590). Note: This is a very small container (approx. 1.5" X .25"). This lubricant can be used with the H.O.T. Magnum (or other filters) to help stop leaks due to worn or damaged seals.

Our Price: $3.99