Middletown Manufacturing, located in Fairmont, WV, USA, started producing Blowback purging manifolds assemblies as well as quick change replacement parts since early 2001. Our Model 22 Double Purge assemble is an integrated instrument circuit used in the installation of D/P cell, manometer, or other flow indicators where purging of process connecting lines is required. It combines a 10-micron filter, two purge metering restrictions, two ball soft seat check valve, two gauges & 3 needle valves into one small unit. This means the elimination of the mass of tubing, valves, nipples and hazardous glass tube rotameters, which up to now have been necessary.