New old stock. This Welden M4 pump was originally mislabeled and was not the right one for the research project. It has been storage ever since.

This unit has the following materials designation: Wilden Metal M4/WMAT/NE/NE/NE

  • Wetted Parts: Cast Iron
  • Air Chambers: Mild Steel
  • Center Section: Aluminum
  • Air Valve: Teflon Coated
  • Diaphragms: Neoprene
  • Valve Balls: Neoprene
  • Valve Seat: Neoprene

60-Day Hassle-Free Warranty.