Product Identification and Description
The document pertains to the AV191H vacuum pump manufactured by Air-Vac Engineering Company, Inc., located in Seymour, CT. The pump is identified by the part number AV191H.

Connection Specifications
- Air Supply: 1/8-27 NPTF thread
- Vacuum Port: 1/8-27 NPTF thread
- Exhaust Port: 1/4 MPSM thread

Performance Data
- Operating Pressure: 75 Psig
- Vacuum Capability: 27 inches of mercury ("Hg) minimum
- Air Consumption:
- Vacuum Flow (V.F.): 4.3 standard cubic feet per minute (scfm) with 10% tolerance
- Air Consumption (A.C.): 8.1 scfm with 10% tolerance

Notes and Restrictions
- The information contained in the document is proprietary to Air-Vac Engineering and requires written approval for disclosure.

Summary
This technical document provides essential specifications and performance parameters for the AV191H vacuum pump, including connection types, operating pressures, vacuum levels, and air consumption rates. It emphasizes proprietary information restrictions and includes reference dimensions for installation or engineering purposes.