DirecTv BAU4R2-21 Back Assembly KAKU-BRAND NEW-SHIPS N 24 HOURS Condition is Brand New. Brand: DirecTv Model: BAU4R2-21 Back Assembly KAKU Shipped with USPS Parcel Select Ground Mail Or UPS Ground Mail Either At Sellers Option . You Will Receive 1 Ea DirecTv BAU4R2-21 Back Assembly KAKU-BRAND NEW-SHIPS N 24 HOURS RARE VINTAGE COLLECTIBLE SHIPS N 24 HOURS Packed By Our Award Winning Packaging And Shipping Department Long Time E-commerce Seller For Over 20 Years LIMITED AVAILABILITY Follow Our Store For All New Rare Products Posted Daily and Specials Please click https://www.ebay.com/usr/boughtnowcommerce Inventory Box Number: 5710 (4) Lower Level Directv Room, 5710 (4) Main Warehouse 2nd Bay From Rear Product Details; The back assembly unit is responsible for fine-tuning the angle of your satellite dish for the DIRECTV AU9-S, SL5 and SL3 to receive sufficient satellite signal. It is used to connect the dish bracket to the J-mount. The BAU attaches to a mast and has fine-tuning adjustments for azimuth, tilt elevation to lock in multiple satellites at once. The back assembly hardware is what goes between the mast and a satellite dish to fine-fine position for a solid satellite signal. Used on the AU9-S, SL3, and SL5 satellite dish. Compatible with masts that have a 2" outer diamter Uses marked adjustment knobs with numbers so you have full control of the small tuning needed for great signal. Easy to install and user-friendly.