7/8″ diameter plastic plugs for use with 3/4″ diameter borate rods.
Available in black, brown and tan.
These are similar to the black plastic plugs that come with the 10 pack. They’re designed to be used with 3/4″ rods…either Cobra or Impel/Bor8 brands
Plastic plugs, also called “capping plug” are designed for removal and post re-treatment as the borate rods last, on average, between 3 and 10 years.