The IDA-LEZ In-Situ Diagnostic Access Valve features a left-handed orientation with a Chemraz nose piece and Chemraz seal. The IDA Valve increases the accuracy of, and reduces the time needed for, gauge or capacitance manometer zeroing and calibration during preventative maintenance intervals. It also provides a safe, controlled, cost-effective process chamber access port that enables additional functions, such as system leak checks and diagnostics. Accurate, absolute pressure measurement in-situ with the IDA Valve ensures uniformity and repeatability on a system and a system-to-system basis. Process system uptime and productivity are also enhanced, and costs are reduced. The IDA Valve joins a pneumatically actuated primary valve with a manually actuated secondary valve (as shown conceptually in Figure 1), both based on the MKS Cv Valve design. Functionally, it resembles a pair of two-way valves joined by a tee where V1 is the primary valve and V2 is the secondary valve. This configuration allows for two standard, mirror-image port orientations for your system: a left-oriented body and a right oriented body.