Specifications: Round (L/F series) interface compatible with KY-20/LA, KY-25/L, KY-26/F1, KYR-26/F1, KY-35/F1, KYR-35/F1, KY-26/F2, KYR-26/F2, KY-35/F2, KYR-35/F2, etc. Square (C/H Series) interface compatible with KY-25/C, KYR-25/C, KY-32/C, KYR-32/C, KY-25/H, KYR-25/H, KY-32/H, KYR-32/H, etc. Compatible with select mobile air conditioners with a diameter of 15 cm. Connects to the exhaust hose and installs easily on the back of the portable air conditioner. Item Name: Exhaust Duct Interface Model: A71050 Material: ABS Shape: 1#: Round (L/F Series), 2#: Square (C/H Series) Features: Portable, Durable, Easy to Install Diameter: 15 cm / 5.91 in (Approx.) Notes: Please confirm compatibility with your unit before purchasing. Measure the required diameter before buying (based on outside diameter). Due to lighting and screen setting differences, the item color may vary slightly from images. Allow for slight dimensional differences due to manual measurement. Package Includes: 1 x Exhaust Duct Interface