This grill is fantastic, but the original tubes don't last long. Why not do a conversion to fit bigger tubes, either 2kg like I have, or even bigger 5kg tubes.
On the pic below I have removed the original regulator with tube. The purpose of this model is to have somewhere to attach the new tube. You print this bracket, attach on the original screws for the removed regulator.
You need the following items:

Also, you might want to print a cap for the quick connector also, check out my model for that:
https://www.printables.com/model/907322-lpg-connector-cap

The author marked this model as their own original creation.