The MS3420-18A telescoping bushing from AMPHENOL INDUSTRIAL OPERATIONS is a critical component for ensuring a secure and moisture-tight connection in various industrial applications. Primarily used with MS3057 cable clamps and AIT/MS style E/F endbells, this bushing allows for the elimination of dust, dirt, and oil from entering the cable clamp assembly. Its telescoping design enables users to progressively reduce the inside diameter of the cable clamp, creating a more precise and effective seal against the cable jacket. This feature is particularly valuable in environments where moisture ingress could compromise the integrity of the electrical connection. The bushing can be nested, one inside the other, to achieve the optimal fit for a wide range of cable diameters.