1. Stable Construction: This gas transfer hose is made of highquality copper and rubber materials, ensuring durability and wear resistance for longterm use 2. Easy to use: This propane refill adapter hose was developed for the seamless connection between flat gas cartridges and liquid gas cylinders, allowing you to easily refill your air tanks when used correctly 3. Reusable adapter hose: Equipped with a highpressure hose, this flat refill adapter hose for gas tank cylinders is portable. With an inner diameter of 2.1 cm (0.83 inches), an outer diameter of 26.6 cm (10.47 inches), and a length of 100 cm (39.37 inches) 4. and versatile: This lightweight and easytotransport adapter hose for refilling propane gas cylinders is perfect for outdoor activities such as cooking, camping, hiking, backpacking, picnics, barbecues, and travel adventures