GENTEC® Regulator Inlets, Outlets, and Accessories are accurately machined, with high quality brass, to meet CGA specifications. All inlet stems have a 45 micron sintered bronze filter installed and are interchangeable with all manufacturers’ regulators that have 1/4” NPT port sizes. Remove “SF” from model number for ordering inlet stems without filter. For CGA 200, use filter model number R210-56 and for all other CGA connections, use R110-56.