The Manfrotto 160SC1 Suction Cup with Retractable Spike Foot is made to fit upon the 694CX monopod.  The suction cup increases the monopod's effective footprint by ~20x, yielding a significant increase in stability when needed upon certain surfaces.  Retract the rubber cup to reveal a steel tip which provides a firm footing on soft ground.

This monopod foot can be removed and replaced at will, even in the field.