O-Ring Size

People have asked what size the O-Rings are on the new tools. They are #109 on the O Ring size chart and measure 3/32" wall, ID 5/16", OD 1/2". I'm using the standard black Buna-N type but almost any of the materials available would work.

The Glow in the Dark style are usually made of silicone which is much stretchier. So would probably require a smaller size with thicker wall to produce the same degree of tensile stength. If someone figures out a size and source for good GID O-Rings that fit I'd like to know about it. :)