The 1082G037 doesn't show up on ASCO's site any more. 1082GO75 seems like a comparable brass valve for fuel use. Seems like they are about $165. Depending on your batch size, you might consider using the 1082G074, which is a 3/8" valve. It will choke your flame down a bit if, like me you are using 3/4" pipe to 1/2" pipe at the stand, but for 12 gallon batches, I still have plenty of umph for a a direct fired RIMS system and HLT. I don' think you save a ton.
Just be sure to get a valve rated for fuel like those I mentioned and not a cheaper general purpose valve. The GP valve will work fine, but it's life span may be reduced by using it with NG. Not something you want to have fail early without notice.