Cal. Bus. & Prof. Code § 25510

Notwithstanding any other provision of this chapter, a manufacturer may furnish to a licensed wholesaler, and a licensed wholesaler or manufacturer may furnish to an on-sale licensee, only the following specified items of alcoholic beverage tapping equipment: kegs, tapping heads, air lines, alcoholic beverage lines, clamps, washers, coupling devices, rods, vents, valves, keg spacers, and filters for an initial installation in a new on-sale licensed account or for a changeover of equipment from one tapping system to another. A supplier may service, repair, and replace the above-specified items of alcoholic beverage tapping equipment as necessary. This section shall not permit a supplier to furnish or repair alcoholic beverage equipment not specified in this section to an on-sale licensee. Alcoholic beverage tapping equipment furnished by a supplier shall remain the property of the supplier.