Connections Type: ACME male & POL female thread- Fit for QCC1/POL hose and regulator; 1 LB propane cylinder connections. Function: For Your Safety, Propane Tank Adapter automatically cuts off gas flow when pressure is reached. It will ensure you NEVER over-fill your 1lb throwaway cylinder, which is built in safety feature. Advantage: with Steak Saver Converter, you can only hook up a standard 1lb propane tank to your standard/big BBQ gas grill. Material: Solid brass construction makes the propane cylinder connector corrosion resistant,durable, reliable and reusable, which won't be easily corroded.