Ended with this.
Whew glad it's done. Sure glad it's a runner. Just needs a new decal. Took it to work and the shop manager had the check valve out in 30 seconds. Whew. I'm gonna have to get a check valve removal tool. The check valve would have not been saveable. It was rusted in tight. Had a heck of a time getting all the rust out of this baby. Sure looks good next to the Zollinger. I was also surprised on how easy it was to fix a single burner rather than a two burner.