Neoprene Impeller Kit with Cover, Gasket or O-Ring - 6-Blade - 5/16 Shaft Diameter. Jabsco's Neoprene Impeller Kit is used specifically in Jabsco's Water Puppy, Part #6617.. Included:. Cover. Gasket. O-Ring. WARNING: This product can expose you to chemicals including LEAD which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.