I bought dises Set to my Weber Q120 connect to a 5kg bottle (adjusts accordingly to the 11kg bottles) because the standard camping gas bottle for the balcony (and EM mode) then it was too small. This works fine. I can now set up the grill flexible thanks to the length of the hose on the balcony without the gas cylinder go along / to have to change.
Everything you needed to assemble a pipe wrench. Do not forget that the connections are "upside down" tightened. ;)
[Edit: Thanks @ Jört T.]