GROHE kitchen Eurosmart C 32842 flat spout Eurosmart GROHE Eurosmart C single-lever kitchen Eurosmart 1/2 "flat spout single-hole installation GROHE SilkMove 35 mm ceramic cartridge GROHE StarLight chrome finish variably adjustable flow rate limiter swivel spout swivel range 140 degrees mousseur flexible connection hoses quick-mounting system