Converts QCC1/Type 1 Male and POL Female Connection to 1/4 Inch male pipe thread. makes changing propane tanks so much easier, solved propane flow issues. can hand screwed it to the gas tank easily without using any tool. No gas leak on either side. It is well-made, seems to last for a long time. One End Outer QCC1/Type Male Thread, Inner POL Female Thread. Other End 1/4 Inch Male Pipe Thread. The device is very useful, but be very careful not to overfill a disposable cylinder. Suitable for 2 - pound cylinder filling. Connectors have no built-in adjusters. There is a through hole. Adapter shape and Easy to connect attachment and long-lasting durability.Don't use it around open flame or cigarettes or anything stupid like that. It's very safe. A good 's tool. Be sure to keep the bottle in the refrigerator, cold spring, freezer, or freezer. Over time, the gas in the supplier's bottle flow faster and the liquid turn into gas so you don't have to fill it as often. Type:Pipe Thread Adapter Connection: QCC1/Type 1 Male and POL Female Connection to 1/4inch male pipe thread. Pressure range: 20M Connection form: Internal thread Scope of application: Gas conversion joint Colour:brass color Material:brass Size:about 55x33mm Package Contents: 1 x Brass Pipe Thread Adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.