303 Rubber Seal Protectant - 3.4oz *Case of 12* [30324CASE]Rubber Seal Protectant 3. 4oz *Case of 12* 303 Rubber Seal Protectant is an easy, convenient way to keep the rubber seals of doors, windows conditioned and pliable. Helps protect against drying and cracking in extreme temperatures, and rejuvenate color and elasticity to old seals, keeping them looking and performing like new! WHERE TO USE: Use on rubber seals of your vehicles doors, trunk or hood to keep them pliable, and protect against drying or