8511.40.00) 0.4% No change No change On or before 12/31/2020 . 1518. Alternators Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.16.39 New alternators rated to produce voltage at 24 V and current at 500 A or more, designed to power military diesel engine components and supporting systems, such alternators each weighing less than 55 kg and measuring less than 300 mm in diameter (provided for in subheading 8511.50.00) Free No change No change On or before 12/31/2020 . 1519. Used alternators Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.16.40 Used generators (alternators) of a kind used in conjunction with spark ignition or compression ignition internal combustion engines (provided for in subheading 8511.50.00) 1.6% No change No change On or before 12/31/2020 . 1520. Parking sensors, signaling equipment Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.16.41 Parts of signaling equipment, each with pressed sealing on the flanges (provided for in subheading 8512.90.20) 1.5% No change No change On or before 12/31/2020 . 1521. Bulb heaters with or without a fan Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.16.42 Electric heating units designed for permanent ceiling installation, each containing a heater and one or two infrared bulbs, with or without a fan (provided for in subheading 8516.29.00) Free No change No change On or before 12/31/2020 . 1522. Heater fan lights for permanent installation Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.16.43 Heating units each combining a heater, a fan and a light for residential use, designed for permanent ceiling installation, each containing an adjustable louver mounted in the grille, such louver may be rotated 360 degrees for the flow of heat output to be manually self-positioned (provided