Don’t waste dinner just because your propane cylinder ran out of gas. This Male Type 1 X Female #600 propane adapter allows you to quickly switch from your 20# refillable exchange cylinder to a stand-by 1# throwaway cylinder. Simply detach your BBQ Grill black knob tank connection from the 20# refillable propane cylinder and finish grilling by attaching the Black Type 1 to the Male Type 1 outlet side and a 1# disposable bottle to the Female #600 inlet side of this handy adapter. A necessary adapter for every propane BBQ grill.