Johnson Pump's 09-1026B-1 Impeller Kit is designed for pump style F4. Material of impeller is made of MC97/EPDM for cooling. Specifications include outer diameter of 2.00" (50.8mm), inner diameter of 0.500" (12.7mm), and width of 0.87" (22.0mm). Replaces Jabsco No.: 673-001.