Cellulex Cartridge Filter, 323.6mm outer diameter X 660mm long (12.74-inch outer diameter X 26.00-inch long), Open/Closed with 13.46mm (0.53-inch) Bolt Hole Endcaps for AerBooth, Bin Vent, ECB, Large TD, MTD, Pneumafil (2nd In), ProBooth and other brands of cartridge collectors.