Black coffee only for this industrial mug! Webster thoughtfully included a handy conversion chart on the back of this mug ( 1psig = 27.71" wc=2.036" Hg, 1 Gallon = 8.33 Pounds and 1 Kilowatt = 3,412 Btu/hr) as a handy reminder for their java loving (but sometimes forgetful?) employees.
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