This plunger is specially designed for the '2000' & '3000' type leakproof Onoto and has been produced using original specifications.
Due to the design of this plunger a separate backing washer is required to create a seal at the back end of the rubber washer which is supplied free
It is attached to the rod by a 5ba left hand thread and is black in colour. The main body and the end part are assembled using the same 5ba L/H thread which ensures a good seal with the rubber washer
Each plunger purchased comes complete assembled with a 7.78mm diameter rubber washer and is held together with a 0.8mm diameter pin