A food grade waterproof grease with synthetic lubricants, ideal for lubricating rubber O rings or valves on any kegging system. Highly recommended for making ball and pin lock fittings easier to install and remove, and to improve O ring sealing. Useful for improved sealing and longer O ring life when using a Fermzilla Conical Fermenter. USDA H-1 rated, which means it is safe for all applications that have incidental food contact. Operating temperature: 32 F to 250 F. Safe for rubber, silicone, and plastic parts.