As fitted to all small bore 850-1100cc engines. these brass welsh plugs don’t corrode like the steel types.Convex type core plug at 41.4mm (1-5/8) for all early A series blocks up to A plus.
4 required per engine-these are known as the flat type where the centre has to be pressed in so the convex plug spreads out. The Cooper S although same size was a cup type washer AEH592




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