The Daniel Senior Orifice Fittings ® ® provides a fast and extremely simple method of changing orifice plates under pressure without interrupting the flow. This eliminates costly by-passes, valves and other fittings required with conventional orifice flange installations. The many outstanding features found only in Daniel Senior Fittings are the result of many years of experience and research of flow measurement. The term "Senior" applied to an orifice fittings specifically denotes the Daniel designed dual-chamber orifice fitting. Today, the Senior Orifice Fittings is one of many measurement products supplied by Daniel. And, because of Daniel's commitment to high quality manufacturing and service. the Senior Orifice Fittings is widely accepted around the world as the industry standard for accuracy, quality and reliability. Since its original development, the Senior Orifice Fittings product line has grown enormously to serve customers with applications for pipeline sizes from 2 inches to 48 inches and pressure ratings up to 10, 000 pounds per square inch. In addition, the use of corrosion resistant and other special materials makes these products suitable for sour gas service and other special applications. Daniel's most popular Senior Orifice Fittings, the "FlangnekTM," has a weldneck inlet and a flanged outlet. Daniel fittings meet