Sometimes a customer will come into your establishment to replace an old cartridge. Unfortunately, it's not always easy to identify the model, especially if the valve has been discontinued – but using a little detective work, it might be possible.
Apply what you learned: What is the model number of the cartridge he identified? (Hint: Rob already knew the cartridge on the right side of the picture was a 47 111 000 – the height of that cartridge helped identify the cartridge on the left.)
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