I know that when you produce more solar energy than you are using, the electric meter runs backward. Maybe your gas meter will do the same thing if you add gas to the grid. You may just have to get creative in making a connection hose. Try Home depot.
I think a piece of 3/4" diameter threaded steel pipe should do for you my friend. The threading process leaves an oil residue which should be helpful. A lot of burrs though, so man up my friend. You're saving the planet.