7.5 kg will be Butane the blue bottle. Presumably previous owner then had Propane 6 kg the red bottle. You will need to change the hose called a pigtail for a Butane one with a clip on connector
Suggest you change your butane bottle for 6kg propane. I think Calor will swap without charge for bottle just for contents. If you want to uae your caravan in cold weather then butane gas will not work properly in cold temps so you might as well change to propane rather than get different pigtail.
I'm with Opensauce here. Much easier to change the bottle to propane particularly at this time of year when you can get some very cold nights. With butane you can wake up in the morning and find your gas appliances are not working.
DaveS1
If you have bought a 7.5kg Calor butane bottle from shop then provided seal is not broken shop will probably swap it for a 6kg Calor propane bottle which is same size without any further cost.
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Topic: Gas Connection to Gas Bottle
