GROCO U-Lube Cartridge - 3oz. *2-PackU Lube Cartridge 3oz. *2 Pack U lube is a long lasting waterproof grease specially formulated to lubricate and protect internal ball valve components, and to discourage nuisance marine growth. U lube's tacky texture keeps it where it is applied, and helps provide maximum protection against wear, rust, and water washout in non ball valve applications such as bushings and bearings exposed to wet conditions and a wide range of temperatures. For ball