Reed style sender for 21 in. deep marine fuel tanks provides tank level information to a single fuel gauge. 21 in. Reed Switch Fuel Tank Sending Unit | Moeller Marine Products 035768-10 Moeller Marine 21 in. tank level electric reed switch Sender length measures 20 in. long - 1 in. shorter than tank depth Provides a more precise tank level reading than swing arm senders by greatly reducing slosh fluctuation Compatible with US scale (33-240 Ohms) dash mounted gauges For use in gas, ethanol, diesel, bio diesel, and non-potable water tank level applications Compatible with aluminum, plastic, or stainless steel tanks Stainless steel construction with nitrile rubber float All components are designed specifically for the marine environment to prevent rust and corrosion Includes standard 5 hole mounting gasket and mounting screws Replacement gasket kit P/N 035728-10