MS3108B20-15S is a MIL-DTL-5015 compliant circular connector straight plug manufactured by Amphenol. It features a shell size 20 with insert arrangement 15S and utilizes crimp rear release contacts for reliable electrical connections. The connector has a threaded coupling mechanism with J thread class 2A specification of 1.2500-18 UNEF, and shell dimensions including B diameter of 1.256/1.246 inches and E diameter maximum of 0.994 inches. This connector is designed for demanding aerospace and military applications where rugged, environmentally sealed connections are required, offering compatibility with standard MIL-DTL-5015 mating connectors.