Heavy duty ball valve type: The SANDPIPER HDB series heavy-duty ball valve pump is an ideal choice for handling thin, viscous, and liquids containing small solid particles. We offer * * self-priming capability and unique variable port options (side, top, bottom, or dual). The HDB pump has a thick walled structure made of sand cast aluminum, cast iron, stainless steel or Hastelloy, and its diaphragm and check valve can also be made of synthetic rubber, TPE and polytetrafluoroethylene PTFE. HDB uses an extended anti-wear spare parts package.