Our Super Speed Master Water Pump Kits include; 1) impeller, 2) top gasket, and 3) bottom gasket. This fits all Mercury Racing SSM #4 (IV) lower units.
 
The gearcase and water pump should be checked and serviced often to ensure the longest life. Also, check-out our magnet drain plugs and washers, we've found these reduce the amount of water that gets into the gearcase during runtime. 
 
Contact Mike Hill at STVracer@yahoo.com