Imperial Eastman's Equalizing Manifol serves as an economical alternative when installing a differential pressure transmitte When the instrument is mounted in close proximity to the process line, the root valves can be used to perform the isolatio function usually performed by the block valves of a 3-Valve Manifold while the Equalizing Manifold allows you to zero the instrument for calibration. The manifold is mounted between the differential pressur transmitter and the flange adapters usua supplied with the instrument. The extra long flange bolts and the teflon gaskets are included with the manifold.