The 2 burner grill I purchased has a straight supply line extending out the rear of unit. The stock connection is rubber hose and a hose clamp. I want to attach a fitting to the tube to use a tee to split the supply to 2 appliances not just the burners. What is my best option?

Any chance of a picture? What material is that straight supply line? Rubber hose is not used for a gas grill.

Is that gas outlet on BBQ threaded ?
What is that "tube" made of ?
Size of that tube ?

Picture would help

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Milo