; the foregoing designed for domestic use (provided for in subheading 8509.80.50) Free No change No change On or before 12/31/2020 . 1507. Automatic food feeders for dogs and cats Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.16.28 Feeders, each with a self-contained electric motor powered by an external adapter that plugs into a wall socket or electrical outlet or uses batteries, such devices which can be programmed to disperse various quantities of food at pre-set times, designed for domestic use by dogs and cats (provided for in subheading 8509.80.50) Free No change No change On or before 12/31/2020 . 1508. Automatic pet waterers for dogs and cats Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.16.29 Waterers, each with a self-contained electric motor powered through an external adapter that plugs into a wall socket or electrical outlet or uses batteries, such devices which filter a continuously flowing water fountain or replenish water when volume is below a certain fill level, the foregoing designed for domestic use by dogs and cats (provided for in subheading 8509.80.50) Free No change No change On or before 12/31/2020 . 1509. Automatic fish feeders Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.16.30 Feeders designed for use with fish, each with a self-contained electric motor powered by batteries, with retaining clips or clamps to attach to a household aquarium, the foregoing which can be programmed to disperse various quantities of food at preset times (provided for in subheading 8509.80.50) Free No change No change On or before 12/31/2020 . 1510. Electric knives Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.16.31 Electromechanical knives, each with self-contained electric motor (provided for in subheading 8509.80.50), the foregoing only if valued either less than $8 or