Check the listing for details. Rheem Ruud SP21105 Inlet Duct Adapter OEM 21105 Hybrid Water Heater Genuine NEW. Color: n/a, Condition: New. Listed at 78.95 USD. New in box inlet duct adapter for Rheem hybrid water heater. I purchase these in bulk so are brand new made by Protech to properly fit your Rheem, Ruud, and Richmond hybrid hot water heaters (all made by Rheem). If your water heater looks like the one shown with the yellow background, this inlet duct adapter is the correct one. Attach this inlet duct adapter to the air inlet area on the top of your water heater and attach 8 inch ducting (not included) to draw air from another room/location so it operates more efficiently. Comes with 5 self tapping screws and installation instructions (all shown in the main pic). These are in stock in our Phoenix AZ location and ship the same day order received for all orders by 1pm MST and next day if after that time. See my other listings if you need the outlet duct or both the inlet and outlet duct set. If you want free shipping, I can drop ship from manufacturer to you which may take an extra week or so to receive. Contact me for this option. Always visit and check sunshinesupport for your best delivered pricing.