The rear release contact retention system used in the Deutsch RSM series is simple and reliable. It is based on the same system used in connectors conforming to NAS1599 and NAS1600. Contacts are both inserted and extracted from the rear of the connector with a fail safe plastic tool that comes with every connector. All RSMs feature silicone rear grommets with three "O"-ring seals around each wire for environmental performance. Pin faces use a silicone interfacial seal with raised barriers around each pin. When mated these barriers compress into the chamfered lead-ins on the hard face of the socket insert and provide a moisture tight "cork-in-the-bottle" seal. RSMs come in five shell sizes and a number of configurations for contact sizes 22,20, and 16, plus contacts for shielded wire. Mounting styles include the square flange and single-hole mounting types in bath resilient and hermetic receptacles. Push pull plugs are available with lanyards for remote or "blind" installations. Cylindrical, Rack and Panel and solderless hermetic versions are also available.