Oil drip calibration disc with the frequently used pre-1922 number and lines Font.
The oil drip calibration disc (regulator disc) fitted into the recess in top of the regulating valve screw of the Best+Lloyd oil pump with the tubular oil sight glass. Suitable for pumps where the original disc was the non-metallic type. The disc is engraved and has an ivory hue
If your pump is Post-1921 consider using the disc Part Nr.57-462
