[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. [Package Includes] Propane Adapter, Perfect For Hooking Your Small Propane Bottles Up To The Larger One. Warning: Don't use it around open flame or cigarettes or anything stupid like that. [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.