The EMP 1399-39020 Fuel Pump Kit is a high-quality replacement part manufactured by Engineered Marine Products (EMP). Designed to replace Mercury/Mercrusier (MC) 21-857005A 1, and Sierra 18-7817 this kit ensures proper fuel pump functionality for marine engines. With its durable construction and precise engineering, this fuel pump kit is a reliable choice for boat owners looking to maintain the performance of their vessel.