Hy 52FamrME, Super55 is reffering to the aluminum cap which fits on the vacuum chamber of the hydrovac, it is on the end that the hydraulic lines go into. The end is held in place by four "J" bolts which pass through four holes or ears in the aluminum end cap, because the bolts are steel and the cap is made of aluminum the parts are often locked together by corrosion. In order for your core to be accepted the parts must not be broken, hope that helps.
