Propane O-Ring Size

[Sureshot]

Does anyone know what size the o-ring is on the old school propane fittings?
I am talking the ones that go in a 20# tank. For a tank top heater or tiger torch.

 

[Richard Cranium]

3/8-idx9/16odx3/32 thick
or if you have the harbor freight assortment it is R-08

 

[Sureshot]

Thanks. When I used those dimensions it comes out as a 110. That is the common way to size them here.

 

[Richard Cranium]

Glad it worked out for you....