A durable Nitrile impeller is able to tolerate chemical exposure without breaking down. Ideal for fuel and oil transfer pumps, this impeller is also an excellent choice for boats that have operated in contaminated waters. Each impeller is engineered to meet or exceed Volvo specifications to ensure the proper fit and function and comes with an O-ring and gasket for easy replacement and installation. 2"D x 2-9/16" diameter. 18-3038 Applications:• Jabsco: 17937-0003, 920-0003• Johnson Pump: 09-1028B-9• Volvo Penta: 3841697, 877061-2, 21951356 Engineered to meet Volvo specifications Comes with O-ring & gasket for easy replacement | Sierra Nitrile Impeller For Volvo Penta, Part #18-3038