This is the regular converter you can use in most of the Pilot fountain pens.
I think it is terrible. It replaced the CON-20, that was almost as bad as this one.
My problem with it is that if you want to fill it more than like half, you need to syringe fill it. And even when full it doens’t hold that much ink.
I also think that a lot of the Pilot pens that use it could without any problems have been altered for something larger.
All of us pen geeks carry multiple pens anyways. But I really wish