These plugs are meant to cut off airflow during colonization and to maintain water saturation at that stage.
These snap in any 2" Hole. Whether your tub is from us or any of the other major brands, these will fit the holes. The bottom is tapered and will fit snugly even if the hole is off a little.
i needed an extra set of plugs for the monotub. took the original plugs and cut them down, making them into rings- glued filters onto the rings. now i can wash the filters and stick them back into the tub. save a few bucks on filters. thanks people
Like the system using plugs to cap off vents versus taping closed and the idea to buy extra plugs to cut open it's end to put a filter on versus filter on the tub itself .