For use with the 400 gram bellows style grease cartridge. 

HSP-2 comes with the CH-400 grease gun. You cannot connect any adapter tips to this, it is for use with large grease nipples such as A-M6F. Type U nozzle has the same thread to connect to the CH-400, however it is bendable and you can connect tips to it such as the N hole type and the P needle type for smaller grease nipples and oil holes.