Pilot Fountain Pen CON-50 Converter

YES, this converter will work with most pilot fountain pens including pilot parallel and decimo. The only thing that I don't like, since the front body part of parallel is semi-transparent, the ink will stuck in there after you dip the nib into ink. It's kind of annoyed me. The BEST solution and probably cheaper solution is Private Reserve Cartridge filling units (24CAR). You can refill any ink cartridge with any bottled ink. For parallel, you still have that small ball inside the cartridge to stir the ink and it hold much more ink than this converter too.
For other pilot fountain pens, this converter works wonder.

I have one of these and they DO NOT work with he Pilot Cavalier fountain pens. You can install them on the Cavalier but then you cannot close the cap because the pen is thinner than this converter. The converter itself works well just be careful what you are installing it on.

At first, I thought the Con-50 would not hold much ink because of its unique design - the plunger does not go past the first half inch of the barrel. This means you have to suck up and purge ink through the pen a few times to completely fill the converter. Overall, not a bad investment if you want to move into the wonderful world of bottled FP ink!

I would like to re-review this item and up the stars ^_^;;...after a few tries, it's working great now. I find it easier using a dropper to fill the converter and then inserting back into my pilot pen.

I'm using the CON-50 with my Pilot Duo and a Pilot 77 Muyrex, works like a dream, fits well, no leaks. I love it. Personally I prefer it over the Con 20 with the Sac refill. Not sure what the issue with Cavalliers is, but I think my Duo has the same physical dimensions and works great.