The Mr. Heater Propane/Natural Gas Connector Kit has a BTU capacity of 23, 000. It's equipped with safety features such as an automatic shut-off when disconnected and an additional safety valve shut-off. This gas connector kit is both CSA approved and UL listed.• For use with propane gas and natural gas• 1/4" male pipe thread x 1/4" female pipe thread• Full flow male plug• Low pressure• Solid brass construction Automatic shut-off when disconnected & additional safety valve shut-off 1/4"" male pipe thread x 1/4"" female pipe thread CSA approved & UL listed