Globe Marine Run-Dry&reg; Impeller Model 421 for Jabsco 4528-0001, 22429-0001, 8293-0001, Sherwood 9979, Johnson Pump 09-806B-1, Sierra 18-3079, CEF 500100 Made With Run-Dry-- Only Impeller in the World Guaranteed to Run-Dry for Up to 15 Minutes 1-9/16"x 3/4" Deep, 3/8" shaft diameter, Pin Drive, 6 Blades Replaces Jabsco 4528-0001, 22429-0001, 8293-0001, Sherwood 9979, Johnson Pump 09-806B-1, Sierra 18-3079, CEF 500100, Volvo 3586494, 875807, 807369, 833550, 876689, 3580029, 803729, Yanmar 104211-42070 & 104211-42071, DJ Pump 08-41-0601, Volvo 876554-7, Yamaha 104211-42070 Don't get stranded out in the water -- order a spare impeller too. Made in the USA. Water applications only. Includes impeller - no gaskets or O-rings.