Aerotec Environmental Measurements Accessories Manometer 622832 - Aerotec 9415451, The Aerotec 9415451 Manometer features a back side connector with an external thread size of 1/4 inches for secure connections. Manufactured by Aerotec, this pressure gauge is essential for accurate pressure readings in pneumatic systems. It is typically used in industrial and commercial applications where monitoring air pressure is crucial. Aerotec 9415451 Manometer 40mm Dia 16 bar Back Thread 1/4" for Compressors