Service your Gulper 220 or Gulper 320 with this complete kit. This replacement pump head kit for the Gulper 220/320 contains everything you need to service your Whale Pumps Gulper. Kit Includes One Diaphragm One Nyloc Nut M5 One Screw Hex M5 x 16mm One Outlet Valve Tricuspid One Marine Head ¾” and 1” One Valve Inlet and Outlet One Valve Plate One Outlet Valve Housing