Asfaik, most systems will need a regulator between a gas bottle and a ext bbq point as the bbq point should be inboard of the reg.You need one of these hoses which will screw onto one of their Moroccan bottles to your fill point, it’s as simple as that… you system already has a regulator so no need for one…
Gaslow Braided Local Gas Cylinder Connection Hose
The Gaslow Braided Local Cylinder Connection Hose simply screws into the Gaslow filler point and now you can connect any gas cylinder adapter that has a 21.8LH fitting to the Hose. Length 1.5 metres.www.gaslowdirect.com