The plumbing trough is designed for homes that will be built without plumbing initially. I.e.certain regions do not typically provide electrical or plumbing connections as the bathrooms and kitchens are located outside.
However, at some point in the future, it is likely that plumbing and electrical will be required. Thus the plumbing trough is installed to allow a bathroom, kitchen etc. to be installed at a future point in time without a major ordeal.
All MAS™ structures are built with embedded electrical raceways (formed via inexpensive and highly flexible plastic tubing) in the concrete foundation. Thus outside and internal electrical is easily added at any time.
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