From Hirschmann, these flat seal gaskets are for use with the GDSN Series of solenoid connectors.
DIN 43650C Hirschmann
A comprehensive range of connectors and plug bases typically for use with solenoid valves on pneumatic and hydraulic equipment. The inner connector can be rotated through 90° increments so the gland can be positioned in all four directions. Housing material is glass-filled nylon making them impact resistant.
Hirschmann appliance connectors feature terminals that can be screwed onto bare or ferruled conductors, or will accept crimp ring/fork terminals under the head of the screw.
Sockets L. 38mm (overall) H 27mm (inc. gasket) M3 retaining screw Body section 15x15mm Plug base 17x17mm, H 8.5mm