Stanbroil 18" Round Fire Pit Burner Ring, 304 Series Stainless Steel, BTU 147,000 Max 18" Round Fire Ring for outdoor use with 1/2" center Female Gas Inlet Durable Stainless Steel #304, Rated BTU Max : 147,000 (Double Ring) Stylish Design:New cross-bar design for better gas distribution,Suitable for either Natural Gas or Propane.If using for propane an air mixer valve must be installed. Gas Holes are drilled not punched for smoother gas flow creating(Concentric rings increase in diameter for better flame height) Package Contents: 18" Round Burner Ring; 1/2 inch Inlet which includes inlet plug and wrench, Installation Manual Made of 100% Stainless Steel #304 Rated BTU Max: 147,000 New cross-bar design for better gas distribution Punched Gas Holes Dimension: 18&#034;, Double Ring Easy to install Durable construction