Pilot CON-70 Push-Button Fountain Pen Converter

Pilot CON-70 — Push-Button Piston Converter for Pilot Fountain Pens

More ink, less refilling. The Pilot CON-70 is Pilot's high-capacity push-button converter — engineered for writers who demand maximum ink volume and a smooth, one-handed filling experience. A single press of the button compresses the internal piston, and releasing it draws a full charge of ink into the generous reservoir. It's the fastest, most satisfying way to fill a fountain pen from a bottle.

With its bayonet twist-lock fitting, the CON-70 locks securely into compatible Pilot pens for a stable, rattle-free connection. Whether you're filling with a classic blue-black or an exotic shimmering ink, the CON-70's large capacity means you write more and stop less.

Key Features

• Push-Button Piston Mechanism — One-press compression draws ink quickly and efficiently — no twisting required
• Large Ink Capacity — Holds significantly more ink than standard converters or cartridges for extended writing sessions
• Bayonet Twist-Lock Fitting — Secure, rattle-free connection to compatible Pilot fountain pens
• Compatible with Any Bottled Ink — Use any water-based fountain pen ink from any brand
• Transparent Barrel — Visible ink window for easy monitoring of remaining ink level
• Reusable & Easy to Clean — Flush with water between ink changes for a clean refill
• Made in Japan — Pilot's precision Japanese manufacturing and quality control

Specifications

• Brand: Pilot
• Model: CON-70
• Type: Push-button piston converter
• Fitting: Bayonet (twist-lock)
• Compatible With: Pilot fountain pens with CON-70 bayonet fitting
• Ink Source: Any bottled fountain pen ink
• Barrel: Transparent
• Origin: Japan

Frequently Asked Questions

Q: Which Pilot fountain pens are compatible with the CON-70?

A: The CON-70 uses a bayonet twist-lock fitting and is compatible with Pilot pens designed for this mechanism, including the Custom 74, Custom 91, Custom Heritage 91, Falcon, Vanishing Point, and others. It is not compatible with pens that use the CON-40 friction-fit converter. Always verify your pen's converter compatibility before purchasing.

Q: How do I fill the CON-70 with bottled ink?

A: (1) Press the button on the converter to push the piston down fully, expelling any air; (2) submerge the nib fully into the ink bottle; (3) release the button slowly to draw ink up into the reservoir; (4) remove from the bottle and gently wipe the nib. For a fuller fill, repeat the press-and-release once more while the nib remains submerged.

Q: What is the difference between the CON-70 and the CON-40?

A: The two converters differ in both filling mechanism and fitting type. The CON-70 uses a push-button piston and a bayonet twist-lock fitting, while the CON-40 uses a twist knob and a friction push-in fitting. They are not interchangeable — check which fitting your pen requires before purchasing.

Q: Can I use any brand of bottled ink with the CON-70?

A: Yes. The CON-70 is compatible with any standard water-based fountain pen ink — including Pilot Iroshizuku, Diamine, Sailor, Waterman, Lamy, and others. Avoid pigment inks or India ink not specifically formulated for fountain pens, as these can damage the converter mechanism.

Q: How do I clean the CON-70 between ink changes?

A: Press the button to expel remaining ink, then draw up clean water and expel it repeatedly until the water runs clear. For a thorough clean, detach the converter from the pen and rinse under running water. Allow to air dry completely before refilling with a new ink.

Q: Why choose the CON-70 over the CON-40?

A: The CON-70 offers a larger ink capacity and a faster, one-handed push-button filling action — making it the preferred choice for heavy writers and those who use high-capacity pens. The CON-40's twist mechanism offers more precise control over ink draw, which some users prefer. The right choice depends on your pen's compatibility and your personal filling preference.