To connect your RCS built-in gas grill to your natural or propane gas supply the RCS 36-inch flex hose is needed. The hose is a 1/2" inch with 1/2" female flare nuts on one end. The hose is made of stainless steel and is 36 inches long. Stainless Steel. 36" Long. 125,000 BTU Capacity. 1/2" Flex Line with Dual with 1/2" Female Flare Fittings.