Designed for use with fireplace burners that use liquid propane gas, rated up to 90,000 BTUs. Mixes air with your incoming LP gas. The LP air mixing valve can only be used for LP propane. Mixes air at the liquid propane (LP) intake of your fireplace burner to create a more efficient and cleaner burning flame, reducing the soot normally associated with liquid propane gas. Made of solid brass and stainless steel to prevent corrosion and ensure long life of the air mixer. Rated BTU: 90,000 Max. Fittings: 12 inch female or male (with included adapter) NPT on the burner side and 12 inch male NPT on the incoming side. Color: silver + brass Material: stainless steel, brass Package Contents: 1 x 12 inch air mixer Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is .DM