Gas bottle query?

[Woodentop]

Don't forget that the coupling on the cylinder is different between Propane and Butane.
Propane has a female on the cylinder and a male on the high pressure link pipe between the cylinder and the regulator, and you turn the Propane connector anticlockwise to attach it to the cylinder.
Butane has a male thread on the cylinder and a female on the link pipe that screws clockwise.
In modern caravans a common regulator is used that works with both Propane and Butane.

 

[Beachball]

Hi Stuart, the bottles you are looking at are they like these, if so they also come in 5 kg size as well, much lighter than the Calor gas steel bottles, although a bit more expensive. I don't carry two bottles anymore unless I am about to run out, even then the gas seems to last for another week.
View attachment 8742

I think these would be ones we will be looking at if it a go at this site .

 

[JTQ]

Butane has a male thread on the cylinder and a female on the link pipe that screws clockwise.

Not in the OP's case they having stated they have the Calor 7kg Blue bottle, this uses a 21 mm Clip-on connector. I included the adaptor info on an earlier response.
The adaptor to hose interface, is almost certainly to use a LH Butane threaded connection.

 

[Hutch]

I think these would be ones we will be looking at if it a go at this site .

BB, I wouldn't, as you might not be touring, the Calor gas is cheaper, especially on a seasonal pitch. Go for the bigger cylinder and save money on the gas.