Mic-Key Continuous Feed Extension SetMic Key Continuous Feed Extension Set The Mic Key extension set is a medical device used for feeding by mouth. It is intended for use with the Micro Key Low Profile Gastrostomy, Jejunal, and Transgastric Jejunal feeding tubes. Features of Mic Key continuous feed extension set Secure LOK right angle connector: The Continuous Feed Extension Kit from MIC KEY features a SECURLOK right angle connector that provides an incredibly convenient and secure