Arms:10" Long Rectangular Muff Length: 5" This flusher slips over the water inlets on many outboard and stern drive motors Flushes contaminates from the cooling system and allows idling for engine adjustments, installs in seconds with a garden hose Rectangular flusher cups for ease of use 1.This flusher slips over the water inlets on many outboard and stern drive motors 2.Flushes contaminates from the cooling system and allows idling for engine adjustments, installs in seconds with a garden hose 3.Rectangular flusher cups for ease of use. Dimensions: Arms:10" Long Rectangular Muff Length: 5" Item: 72591