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Unlock the full potential of your Platinum fountain pen. The Platinum PQR-200 Rotary Piston Converter is the official ink converter designed for Platinum fountain pens, allowing you to fill directly from any bottled ink rather than being limited to proprietary cartridges. The twist-fill piston mechanism is smooth, precise, and reliable — drawing a consistent volume of ink with each rotation and sealing cleanly to prevent leaks. One converter. Unlimited ink choices.
If you use a Platinum fountain pen with bottled ink, this is the component that makes it possible.
Ink cartridges are convenient — but they limit you to a handful of pre-filled colours and generate plastic waste with every change. A piston converter like the PQR-200 opens your pen to the entire world of bottled fountain pen ink: hundreds of colours, dozens of brands, shimmering inks, iron gall inks, water-resistant inks, and everything in between. Refilling takes under a minute. The cost per fill is a fraction of a cartridge. And the ritual of dipping the nib into a bottle of ink you chose yourself is, for many writers, one of the most satisfying parts of using a fountain pen.
A: The PQR-200 is compatible with Platinum fountain pens that use the standard Platinum cartridge/converter fitting — including popular models such as the Platinum Century 3776, Preppy, Plaisir, Cool, Balance, and many others. If your Platinum pen accepts a standard Platinum cartridge, it will accept the PQR-200 converter. If in doubt, check your pen’s model specifications or contact us before purchasing.
A: Yes. The PQR-200 is compatible with any standard bottled fountain pen ink from any brand — including Iroshizuku, Diamine, Pilot, Sailor, Waterman, Private Reserve, and others. We recommend flushing the converter with clean water before switching between ink brands or colours.
A: Insert the converter into your pen, turn the piston knob counter-clockwise to expel air, submerge the nib fully into the ink bottle, then turn the knob clockwise slowly to draw ink into the chamber. Wipe the nib and grip section clean before capping. Full filling instructions are included in the product description above.
A: Flush the converter by filling it with clean, lukewarm water and expelling it several times until the water runs clear. Repeat as needed when changing ink colours or putting the pen into storage. Do not use hot water or cleaning agents, which may damage the seals.
A: The PQR-200 is designed for long-term use with regular cleaning. If the piston becomes stiff or dry after extended storage, a small amount of silicone grease applied to the piston seal will restore smooth operation. Replacement units are inexpensive if a seal fails after extended use.
A: A piston converter (like the PQR-200) uses a threaded screw mechanism to draw ink in with a controlled, precise stroke — generally allowing a fuller fill and better control. A squeeze converter uses a rubber sac that you press and release. Piston converters are generally preferred by experienced fountain pen users for their reliability and fill volume.
A: Yes. The Platinum PQR-200 is an official OEM converter manufactured by Platinum Pen Co., Ltd. (Japan) — not a third-party or aftermarket product. It is the same converter included with many Platinum pen sets sold globally.
A: The PQR-200 uses Platinum’s proprietary fitting dimensions and is designed specifically for Platinum pens. It may not fit pens from other brands (such as Pilot, Sailor, or Lamy), which use different converter standards. Always verify compatibility with your specific pen model before purchasing.











