Globe Marine Run-Dry Model 630 Impeller for Jabsco 18958-0001 and Sherwood Pumps 17000 Made With Run-Dry. Guaranteed to Run-Dry for Up to 15 Minutes 3-1/4" Outer Diameter, 2-7/8" Width, 20mm Shaft diameter, Keyway Drive, 12-Blades. Impeller only-no gasket included. Fits Caterpillar 7E0321, Cummins 3897337 & 3916852, Jabsco 18958-0001 & Sherwood Pump 17000K Don't get stranded out on the water-- order a spare impeller today. Water applications only. Made in USA.