S111 - Parker Standard Size GT Piston Converter £12.95 Pressure Bar: [Choose]55mm60mm65mm73mm76mm84mm Quantity: at £12.95 each Add To Basket Parker GT Converter A converter for all modern Parker Pens. It will all Cartridge / Converter Parkers from the 45 right through to the current Duofold Centennials and Internationals. This one has a gold filled trim. New Old Stock. Postage in the UK is free on this item!