Features:
Solid Brass Construction: Made From Heavy Brass Material, Long Lasting Durability, Solid brass construction makes it corrosion resistant.
Used For Propane Or Natural Gas: 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 the hole.
1/4" Male Pipe Thread: Converts QCC1 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.
Wide Usage: Fits for Propane System RV Trailer, Fish Cooker, Turkey Fryer, Barbecue Grill, and More. Used for Propane or Natural Gas, Not for use in potable drinking water applications.

Specifications:
Material: Brass
Internal thread and external thread: 1/4" NPT+M10*1
Size: 5.52*3.32cm(2.17*1.31in)

Using Instruction:
1: Put The Empty Little Tanks In The Freezer For More Than 30 Minutes.
2: Attach The Coupler To Your Propane Tank.3: Attach Your Empty Tank (Fresh From The Freezer) To The Adapter.
4: Pick Up Your Large Tank And Turn It Upside Down And Rest It Securely On The Corner Of Your Table.
5: Open The Propane Valve And Shut It Off When The Flow Of Liquid Propane Stops.
6: Turn Everything Right Side Up And Remove The Little Cylinder.
7: Repeat As Necessary.

Package Include:
1 x Propane Gas Fitting Adapter