Installed a Valor Portrait natural gas direct vent stove. Everything went well until the gas line had to be installed. The stove has a 3/8" gas connection. I have tried several different ways to get the line and a shutoff in the limited space available under the burner. Easy to get the gas line in the space, but the shutoff valve is difficult and probably wouldn't be accessible to shut off if necessary in an emergency. Have tried a 6" stainless flex line and a 12" flex line. All suggestions welcomed.