x2 Replacement Piston O-Ring for Noodler's Konrad Flex Fountain Pen

*We will no longer be stocking Noodler's brand, so this is the last of it! 100% of your purchase of any Noodler's item will be donated to Black Lives Matter. *

Pack of x2 O rings for the Noodler's Konrad Flex Fountain Pen. They sit inside the piston mechanism on the plunger, forming a watertight seal. There are two fitted in each pen.