Cadac 28mbar Butane Clip-On Regulator QR – 21mm EFV Hose Calor and Flogas butane cylinders have that distinctive 21mm clip-on valve, a connection type that only works with the right regulator. And that's this one. If your cylinder is a Calor 4.5kg or 7kg butane, or a Flogas 5kg, 7kg, or 13kg butane - this is the one that's going to hook up straight to any Cadac QR-equipped BBQ or stove at the perfect pressure of 28mbar. The way this thing clips onto the cylinder valve is just brilliant - no tools, no threading, just a really neat and fast way to get connected, especially when you're out in the elements and your hands are frozen or you've not got much space to play with. The little gauge on the side is a real bonus too - just a quick glance and you can see exactly how much gas you've got left without having to lift the thing or weigh it. The 85cm hose is a r