Installation of this product, you can use or natural gas as a fuel, while not changing the gasoline as the fuel, then the generator can be used either oil Special Features: Vacuum carburetor Item Type: Dual Fuel Generator Carburetor Fitment: for GX390 GX340 Gas Small Engines For LPG( )pressure range: 2.8 KPA-3.8 KPA For NG pressure range: 2.0 KPA-2.6 KPA Pressure regulating valve output pressure: 0.03-1.56KPA Pressure regulating valve closing pressure: 3.50KPA Colour:As Shown Material:Metal Package Contents: 1 x Dual Fuel Generator Carburetor Only the above package content, other products are not included. Note: Light reflection 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 +/- 1-3cm.