Commercial Grade Class Four
Posted by Ardis on September 11, 1999 at 09:45:27:
The TOTO Ultramax toilet is listed as commercial class four. What does this mean in terms of how it is made and how many different classifications are there in the toilet world? Is there a master plumbing website with a chart of some kind showing the different classes? Does the commercial class four designation require anything different in the way of pipes or pipe fittings than a "residential" model?

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