For sale is a drive shaft installation tool for compressing and installing the drive shaft seals into the injection pump when installing the pump drive shaft. This is used for all the Stanadyne / Roosa Master injection pumps that do not have the front roller bearing. Is is for most pumps that have the JDB, DBGVC, DBGVCC, DBGFC, DBGFCC, DCGFC, DCMFC, and some DB2's. If you are not sure if this is the correct tool then just email us and ask.