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The large O-ring is part of the bayonet assmbly. The bayonet assembly includes the bayonet housing, yellow puppet or magnet, large O-ring and small O-ring. The bayonet assembly holds the solenoid on our C017-C029, 3/4” through 2” (DIG 510-075 to 510-200) battery operated controllers and model C026 - C028 solenoids with inline valve (DIG model 337.xxx). Inside the bayonet assembly the puppet can be found supported by a large O-ring and on the bottom of the bayonet assembly the small O-ring can be found, supporting the solenoid opening and closing. If any of the bayonet assembly parts are missing, the valve will stay open.