Three pressure regulators are offered, suitable for inlet pressures up to 20 bars and 400 bars. In all cases the metal parts exposed to the sample gas are stainless steel. The small regulator is capable of reducing the sample gas to 1 bar pressure in a single stage, but with difficult gases like CO2 it is advisable to connect two regulators in series to give two stage reduction. Supplied with fittings for 1/8" od copper or stainless steel piping. Fittings also available for 1/4" or 6mm pipe on request.