This Whale Mk5 Universal Manual Pump Service Kit includes replacement parts for the popular Mk5 pumps. Parts include the pump’s diaphragms, valves, and circlips. These are production parts, so they will install and fit properly, and they will deliver the same outstanding performance as the original components. Whale designs and manufactures reliable marine water systems which are easy to install and use; providing boating enthusiasts with water, waste management and durable bilge pumps. For over 70 years, Whale has delivered innovative, high quality products that ensure peace of mind and allow you to enjoy your adventures on the water.