What size is the 'O' ring on Auster Fuel Cock

[Proctor VH-AHY]

G'Day All

Wondering if someone can help with a modern equivalent for the small 'O' ring that is used to seal the spindle on the fuel cock.

I have the old one but it has gone hard and fuel slightly weeps around the spindle.

cheers

[evansb]

You may wish to consider posting your question on the Tech Log thread.
Perhaps even the Engineers and Technicians and Private Flying thread.