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PVC pipes were embedded in the Reef Balls so that fiberglass rebar anchors could be used to attach these breakwater units to the seafloor.
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Here's how the PVC pipe is cast into the Reef Balls. It is cut off at the concrete level before removing the mold shells.
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We placed an 8" concrete brick into the bottom of the molds to add an extra 12 inches of solid concrete to the bottom of the Reef Balls for extra stability.
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These hoses are used to attach scuba tanks to underwater drills so we can drill the holes for the fiberglass rebar anchors.
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Here is the inside of a mold set up for casting with the brick, sand on the bottom to make a lobster hole going to the brick and all the side balls in place.
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We took measurements of the hole sizes to make final adjustments before we went into large scale production