18-inch 90 Degree is used in designs where one terminating line
of Multi-Flow is connected to another at a 90 degree angle.
The 90 degree angle can be from the right or the left.
Since Multi-Flow pipe can easily negotiate a 90 degree turn
in its own, the 1800N is required only when a bottom outlet
is desired such as in a herringbone that empties in the center.
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