MS27488-12-3 is a sealing plug designed for use in aerospace and defense connector applications. This yellow-coded plug features precision-engineered dimensions with diameter A of 0.160–0.170 inches, diameter B of 0.115–0.125 inches, and diameter C of 1.391–1.441 inches, meeting strict MIL specifications for mechanical endurance and environmental performance. The plug is manufactured from composite materials engineered to withstand demanding physical and environmental requirements while maintaining minimum weight and maximum durability. These sealing plugs are commonly used in connector assemblies to protect unused contact positions and maintain system integrity in severe aerospace, military, and high-end industrial environments.