C Series Seal KitThe C Series Seal Kit is a replacement kit for centrifugal c series pumps. The seal kit in a centrifugal pump should be replaced approximately once a year, or when leaking or a decrease in efficiency occurs. How often you should replace your seal kit depends on the application and the frequency you use your pump. The D seal centrifugal pumps require a Mechanical Seal Kit. The DG Seal Kit fits C114, C216, C,218, and C328 pumps fitted with a DG seal