BillSmith
TVWBB Pro
Ok, finally have a picture. The gasket is the little red ring around the brass piece and seals against the gas control bracket.
Thanks for the picture and sorry, I don't have any experience with your grill so I can't give you any real help. I have not seen this type of gas valve before. Mine are the type that you put gas pipe dope on the threads and screw into the manifold. Yours appears to be a type that you bolt into the manifold.
Not sure what you mean by tank glides.