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300209-03 RCD adapter 5/8 to 3/8 and .5" tall can use 300209-05 also 5/8" long instead of .500" long
RCD Cam Gears are 5/8� - So you need this to adapt to a 3/8� for driving fuel pumps
For putting fuel pumps on RCD ,Gear drives*
They should press in but if it does not than we suggest the customer weld a dot in front of the adapter on the shaft to prevent this adapter from ever moving *