Universal round connector with standard thread structure. Effortlessly connects separate exhaust hoses, extends your original AC hose length, and keeps tight airtight sealing to prevent hot air leakage. Tool-free direct installation. No extra tools. Simply twist and lock onto your exhaust hose for quick assembly and disassembly. Built to withstand long-time daily use of portable air conditioner ventilation system without cracking or deformation. serving as a stable connecting adapter between AC unit and exhaust duct. Essential replacement & extension accessory for mobile portable AC units. Ideal for household exhaust hose repair, connection and length extension applications.