A flow valve for faucets such as kitchen and bathroom faucets includes an inlet and outlet and a transverse valve mechanism where a valve element moves toward and away from a valve seat at least partly transverse to incoming inlet flow andor outgoing outlet flow. In a three-dimensional color space the reduced gamut is derived from the reproduction device’s gamut by reducing its size in all three dimensions. The shaft insert is initially held in place by friction between the shaft and the shaft insert, optionally with a joining agent located therebetween, until a final setting of the shaft insert is determined.