Fuel Gas Canister Adaptor Large 1" to Small 7/16" Thread Connection - USA to EU 
Kemper Group Product

Never be stuck without a gas canister again!

This fuel gas canister adaptor allows you to screw the better large 1" (25.4mm) threaded gas canister to your blowtorch or regulator that has the smaller 7/16" (11mm) thread connection.  The better gas canister with the larger thread should provide improved performance as the gases are generally either pure Propane or pure Propylene. 
NOTE
Be aware that there is a cheap gas with large thread, in a yellow canister which is mixed with Butane.  This gas is the same as the cheap smaller threaded canisters.

The cheap butane mix gas canisters with the small thread (7/16") are mostly Butane with a bit of Propane and Propylene, being mostly Butane the gases are not as good as the yellow Propylene or blue Propane gas canisters with the large connection thread, this adaptor give you the ability to fit the better larger threaded disposable gas canisters which means you never need to be stuck without a fuel gas canister.

The large 1" thread is typically the American thread connection whereas the smaller 7/16" thread is more common in Europe.  UK makes use of both.

This fuel gas canister adaptor is a must for your toolbox, it is your insurance policy giving you the option to be able to use any fuel gas and never be stuck.

Note
It is important that you screw the adaptor to your regulator or blowtorch before fitting the adaptor to the gas canister - if you don't do this gas will escape.