Edson Marine to Fold-Down Adapter 3-1/2" Mast Pipe. 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 separately) if mounting to a vertical surface and folding tower fore and aft. Specifications for Edson Marine Pipe to Fold-Down Adapter 3-1/2" Mast: Manufacturer: Edson Marine Color: Black Package Contents: Edson Marine Pipe to Fold-Down Adapter 3-1/2" Mast Edson Marine 990-35: to Fold-Down Adapter 3-1/2" Mast Pipe