Sheaffer Shaft Seal Unit Repair Kit Quantity: Price: £8.99 Add to Wish List For use with Sheaffer's PLUNGE (VAC) FILLER PENS. These items are for repairing the Shaft Seal unit at the end of the barrel that the plunge rod is pushed through. 3 plunge unit gaskets: This replaces the old felt and rubber from the unit. 3 plunge unit sealing washers: This is fitted and glued in after the gasket to ensure that there is no movement of the gasket, and an airtight seal for the rod when in operation. THE PEN AND EMPTY UNIT ARE SHOWN FOR DISPLAY ONLY AND NOT INCLUDED IN THE SALE.