Flamesources dot com conversion kit. Factory instructions are included. This is everything you'll need to convert this grille for a North American grille with a tank mounted underneath the grille. These brass orifices are a replacement for grilles that use male threaded orifices. Many bar-b-ques use these types of orifices, and they might retrofit a number of other brands.  These are made for that specific Weber model with front control knobs (not side knobs) made after 2010.

This set includes 3 orifices for a grille with up to 3 main burners. The hose on this regulator is considerably longer than the original equipment hose that came with Weber grilles, stretching some 27 inches from the tank.. Other manual adjustments might be necessary, so check your factory instruction manual details. FOB Origin.

The Weber Genesis S-310 is a stainless steel version of this grille, while the WEBER GENESIS E-310 looks like this:

Weber Genesis E-310 Grill