The ETCO Fast-Loc Expansion Plug Loop Nut RPL-1400 is an innovative solution for efficient duct sealing, specifically designed to work with smooth, ribbed, or corrugated duct types. Crafted with a durable, injection-molded PVC body, this non-metallic plug features a mechanical expansion seal that securely fits within conduit or innerduct, effectively preventing leakage. Included with the plug is a handy rope loop and 1/2" rope tie, ensuring ease of installation and removal while allowing for convenient attachment. Additionally, the ETCO-formulated polyurethane sealing gasket, available in gray or black, enhances the reliability of the seal, making this expansion plug a reusable option. Its distinctive loop-nut design not only facilitates hand tightening but also accommodates various duct sizes, ensuring a snug fit within the specified range of 1.156 to 1.510 inches in diameter.