A clip-on gas regulator is a low pressure device that fits on top of the cylinder valve and locks into place when pushed downwards.
The regulator is connected to the appliance by a hose which is pushed over the spigot, also known as a barb.
There are many types of on the market. The clip mechanisms vary in design, with some easier to use than others.
For more information see: How to fit a clip-on gas regulator.
Many clip-on regulators now have a double locking lever which closes both the cylinder valve and the valve inside the regulator for extra security. There is also a release button that you push in when you want to remove the regulator.
Clip-on regulators are available to fit either butane or propane gas cylinders.