{"product_id":"pilot-con-40-converter-twist-piston","title":"Pilot CON-40 Fountain Pen Converter Twist Piston Ink Filling","description":"\u003ch2\u003ePilot CON-40 — Twist Piston Ink Converter for Pilot Fountain Pens\u003c\/h2\u003e\u003cp\u003eBreak free from cartridges. The \u003cstrong\u003ePilot CON-40\u003c\/strong\u003e is Pilot's classic twist-piston converter — a simple, reliable mechanism that lets you fill your Pilot fountain pen directly from any bottled ink. Twist the knob, dip the nib, twist back, and you're loaded with the ink of your choice. No cartridges, no waste, no compromise on color selection.\u003c\/p\u003e\u003cp\u003eThe CON-40 is the gateway to the full world of bottled fountain pen inks — thousands of colors, sheens, and shading properties that cartridges can never offer. Compact, well-made, and built to last, it's the first upgrade every Pilot fountain pen owner should make.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwist Piston Mechanism\u003c\/strong\u003e — Simple, smooth rotary knob draws ink directly from any bottle with reliable suction\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible with Pilot Fountain Pens\u003c\/strong\u003e — Designed for Pilot pens with standard converter-compatible sections (e.g., Metropolitan, Kakuno, Prera, Penmanship, and more)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse Any Bottled Ink\u003c\/strong\u003e — Unlocks access to the full range of bottled fountain pen inks from any brand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReusable \u0026amp; Easy to Clean\u003c\/strong\u003e — Flush with water between ink changes for a clean, residue-free refill\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransparent Barrel\u003c\/strong\u003e — Visible ink window lets you monitor remaining ink at a glance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact Design\u003c\/strong\u003e — Slim profile fits neatly inside compatible Pilot pen bodies without adding bulk\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade in Japan\u003c\/strong\u003e — Pilot's precision Japanese manufacturing and quality control\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eBrand: Pilot\u003c\/li\u003e\n\u003cli\u003eModel: CON-40\u003c\/li\u003e\n\u003cli\u003eType: Twist piston converter\u003c\/li\u003e\n\u003cli\u003eCompatible With: Pilot fountain pens with standard converter fitting\u003c\/li\u003e\n\u003cli\u003eInk Source: Any bottled fountain pen ink\u003c\/li\u003e\n\u003cli\u003eBarrel: Transparent\u003c\/li\u003e\n\u003cli\u003eOrigin: Japan\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003ch4\u003eQ: Which Pilot fountain pens is the CON-40 compatible with?\u003c\/h4\u003e\u003cp\u003eA: The CON-40 is compatible with most Pilot fountain pens that accept a converter, including the \u003cstrong\u003eMetropolitan, Kakuno, Prera, Penmanship, Pluminix, Explorer\u003c\/strong\u003e, and many others. It is not compatible with pens that use the CON-70 bayonet fitting or proprietary cartridge-only designs. When in doubt, check your pen's product page for converter compatibility.\u003c\/p\u003e\u003ch4\u003eQ: How do I fill the CON-40 with bottled ink?\u003c\/h4\u003e\u003cp\u003eA: Insert the CON-40 into your pen, then: (1) twist the knob counterclockwise to push the piston down fully; (2) submerge the nib into the ink bottle; (3) twist the knob clockwise to draw ink up into the reservoir; (4) remove from the bottle and gently dab the nib with a cloth. Repeat once or twice for a fuller fill.\u003c\/p\u003e\u003ch4\u003eQ: Can I use any brand of bottled ink with the CON-40?\u003c\/h4\u003e\u003cp\u003eA: Yes. The CON-40 works with any standard water-based fountain pen ink from any brand — including Pilot Iroshizuku, Diamine, Sailor, Waterman, Lamy, and others. Avoid using India ink or pigment inks not specifically formulated for fountain pens, as these can clog the mechanism.\u003c\/p\u003e\u003ch4\u003eQ: How do I clean the CON-40 between ink changes?\u003c\/h4\u003e\u003cp\u003eA: Twist the piston down to expel remaining ink, then draw up clean water and expel it repeatedly until the water runs clear. For a thorough clean, you can remove the converter from the pen and rinse it directly under running water. Allow to air dry before refilling.\u003c\/p\u003e\u003ch4\u003eQ: What is the difference between the CON-40 and the CON-70?\u003c\/h4\u003e\u003cp\u003eA: Both are Pilot piston converters, but they use \u003cstrong\u003edifferent fitting mechanisms\u003c\/strong\u003e. The CON-40 uses a push-in friction fit, while the CON-70 uses a bayonet (twist-lock) fitting. They are not interchangeable — check which fitting your pen requires before purchasing.\u003c\/p\u003e\u003ch4\u003eQ: Is the CON-40 worth it if I currently use cartridges?\u003c\/h4\u003e\u003cp\u003eA: Absolutely. Switching to a converter opens up thousands of bottled ink options at a significantly lower cost per milliliter than cartridges. It also reduces plastic waste and gives you full control over your ink color, shading, and sheen properties — a worthwhile upgrade for any fountain pen user.\u003c\/p\u003e","brand":"Pilot","offers":[{"title":"Default Title","offer_id":46559287541794,"sku":"PILOT-FPC-CON40","price":12.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0902\/3045\/6354\/files\/O1CN01PEXxAT1jTUlZAnvtv__2209244264549.webp?v=1787756902","url":"https:\/\/www.xypen.com\/products\/pilot-con-40-converter-twist-piston","provider":"XYPen","version":"1.0","type":"link"}