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This is the valve retaining collar of the type fitted to Douglas 2 3/4hp models, used to retain the valve springs by means of this collar and a steel pin that fitted through a hole at the end of the valve.  This type has slightly modified design over the original - having an additional milled slot, to help retain the pin and prevent collar spinning around the valve (see detail listing for more information). The collar is CNC manufactured from EN24T while the pin is from Silver Steel.  Price is for one collar and one pin (4 required per engine)