Specifications: Round (L/F series) interface suits for 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 suits for 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. Applicable to part of mobile air conditioners with a diameter of 15cm. Connected to the exhaust hose, and can be easily installed 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: 15cm/5.91" (Approx.) Notes: Please confirm if you can use it on your machine to purchase. And be sure to measure the diameter you need before purchasing (Based on the outside diameter.) Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Exhaust Duct Interface