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I got a call to a power plant that had hot water going to the toilets and urinals for the last 8 years. The showers were also a problem, some of the handles were frozen, or wouldn't shut off all the way. The mainteanace planner thought it might be the tempering valve, evebn though it been changed 3 times in the last 8 yeras, and check valves had been added everywhere there was a bald piece of pipe. He asked about demoing the shower valves and surface mounting all new shower valves. I look in the shower room and laugh. The faucets were chicago brand. I installed new ceramic 1/4 turn cartridges and solved the shower problem and the hot water crossover in one stroke. No need to demo pipe in a confined space and install new. I saved them thousands of dollars and fixed their problem the same day. I am in the process of changing cartridges on about 50 shower faucets right at a sister plant. here, the problem is cold crossing into the hot.
Jeff
Jeff