Filtex Bag 9 gal (Airvac) Central Vacuum (4)
Filtex (or Filtrex) and others. Replaces all Filtex bags between 14 and 18 inches tall. (The length variation over the years is due to changing bag manufacturers.)
Also fits all or some units made by: Brute, Central Vac International, D & R Vacuum, D&R, Star.
Top of bag has 1.25 inch round cardboard lip and 13.5 inch total diameter