Introducing Our Square Burners The 48" Square Stainless Steel Ring is the perfect addition to your fire pit. Square ring with 3 concentric ring & a 3/4" hub Ports are staggered for a more realistic flame For optimal flame height, we recommend at least 300,000 BTU Available for natural gas or LP Liquid propane Ports must point up for propane LP For LP Liquid Propane you must add air mixing orifice to reduce sooting