The 1-350379-1 is a strain relief adapting grommet designed for use with Miniature Rectangular (MR) connectors. This grommet is constructed from flexible, black PVC with a 55/75 durometer rating and is designed to adapt clam shell strain reliefs for 9, 12, and 15 circuit connector housings. Key dimensions include an inner diameter of 0.250 inches, an 'A' dimension of 0.375 inches, and a 'B' dimension of 0.420 inches. It is used in conjunction with strain reliefs to secure wiring and protect connections from mechanical stress.