A faucet range in stainless steel AISI 316L available with single handle, dual handle and thermostatic mixers. The circle/square dualism that characterizes DUET is emphasized by the satin finish of the circle that constitutes the tap handle, and by the polished finish of the square detail. The glossy square, set in the handle, gives the product three-dimensionality and preciousness. The refined design of DUET has been worth the ornamental model.