Edson Pipe to Fold-Down Adapter 3-1/2" Mast [990-35]Pipe to Fold Down Adapter 3 1 2" Mast Edson's Fold Down Adapter 3 1 2" Radar Masts attaches to the bottom of your radar mast allowing it to fold down. Fold Down Towers are perfect for trailer boats, low bridge clearance and end of the season storage. By using a992 35 Pivot Bracket (sold separately) and Fold Down Adapter with your Standard Radar Mast, you can also mount your radar on a raked transom or coaming side. Use 989 1 Right Angle Base (sold