Hubbard Ground Expansion Plugs

  • The ground expansion plug offers the greatest level of holding power or leak resistance available in an expansion plug.
  • Ground Plugs, installed in a correctly prepared counter bore, should eliminate the need for sealer and should hold highly penetrating liquids.
  • We offer a wide range of ground plug sizes – 3/8″ to 3″.
  • We are the original patent holder and manufacturer of the Welch Expansion Plug since 1913, and the only manufacturer of the ground edge expansion plug.