It sounds like you might be looking for the Propane Hose - 3/8" Female SAE Swivel x 3/8" Male NPT - 2-1/2' # 37207-31405, which is 30 inches long and has a 3/8" Male NPT fitting on one end; we don't have anything that tells us what propane hoses were used on particular setups but most regulators have a 3/8" female fitting on the outlet, which would match the 3/8" Male NPT fitting on the # 37207-31405.
If you find that you've got a different fitting on your regulator or propane lines and... view full answer...