Pair MAC model 225-111C AC/DC compressed air solenoid valve
Pair of MAC model 225-111c industrial electrical solenoid valves. They are rated for either 120 volts AC or 24 volts DC and for pressure from vacuum up to 150 PSI. They are about 3 3/4" long.
These are from the estate of an industrial engineer and have wear and soil as well as old labels from a previous installation.