The LX2051B-320P two valve group is used to install the flanged absolute pressure or pressure transmitter directly, and can be installed directly by long bolts and 3051CG or 3051CA with coplanar flange. The process of the two valve group of the coplanar flange is connected to the internal thread of the 1/2 -14NPT and the traditional flange with the fixed bolt Center distance of 41.3 mm.