Service for HP Swivel

[d^2b]

9.525mm
12.75mm
1.778mm

O-ring 9.52x1.78. This is a standard size.
O-ring -012 is 9.25x1.78 this might work as well but is less perfect than 9.52x1.78

I have a swifel as well which needs 9.52x1.78.

And don't forget: NBR90, not NBR70

I guess I would have never thought to look for an obviously imperial set of measurements in a list of metric o-rings, so thanks for that. I found it it one list of DIN sizes, but I haven't found a source in Canada yet.