Perfex Series 155 Magic Dial Thermostat
Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
Some Usage Consequences with Orifice Drain Devices
This tech sheet about usage consequences with orifice drain devices was developed by the members of the Fluid Controls Institute in August, 2003. Thanks to T.P. Tunstall for finding and sharing it with us.
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