Q: I have several of your 5 gal pin lock kegs (#310-4900)? I need a couple spare o-rigs to seal the lids... does this fit the 5 gal ball lock kegs (310-4900)? do the lid rings I your 3 pack (#99-2641-3)?
A: This lid gasket actually fits bot the new stock, and used stock ball lock kegs as well as pin lock kegs. the only kegs that may have a difference diameter lid gasket would be the race track, or non traditional lid kegs.
Q: Are these o-rings silicone, buna-n, ...?
A: They are made of food grade rubber.