Sierra 18-3383 Water Pump Kit for 20 - 28HP Johnson, Evinrude Outboards Sierra replacement water pump kit for Johnson and Evinrude Outboards. Sierra engine parts are engineered to meet todays high horsepower engine demands and stand up in the harsh marine environment. Sierra replacement engine parts meet or exceed OEM requirements. All sierra engine parts are backed by an industry-leading warranty. Water Pump Kit Includes 1 18-3051 - Impeller 1 18-3363 - Housing 1 18-3358 - Water Pump Cup 1 18-3