Miele KM 406 Installation Instructions Manual page 22

a Needle valve with small orifice
(0.25 for propane).
b Needle valve with large orifice
(0.54 for propane).
22
^ Using a small screwdriver, unscrew
the needle valves and remove them
with a pair of needle nose pliers.
^ Insert the new valves and screw them
into place.