Johnson 09 1028B 9 Impeller Kit for F7 Pumps (Nitrile) Jib Reefing & Hull Fittings Provided with a brake Size::F1 Provided with a brake tension release system easily adjustable Sheave Ø mm: 65 Sheave width mm: 18 Rope Ø mm: 16 Break Load kg: 1600 SWL (Kg): 800 Length mm: 142 Weight (g): 267 The Johnson flexible pump impeller is designed to be installed to some of the F7 range of Johnson Pumps which suits the impeller dimensions listed below It is highly recommended to make sure you use an original pump impeller for your flexible impeller pump as this will ensure that the quality complies with the performance and dimension requirements for each pump type