An irrigation mainline assembly incorporates a normally closed master valve and an insertion style flow sensor installed within rectangular plastic valve boxes with covers. The master valve connects to piping supported by bricks over a minimum depth of four inches of three-quarter-inch washed gravel, maintaining ten times the diameter of the pipe upstream and downstream spacing requirements. A flow sensor with a double-strap saddle connects along the line, maintaining five times the pipe diameter spacing downstream. Control wires route from decoders to the master valve and flow sensor, with concentric reducers transitioning pipe sizes and wire splices detailed per project specifications.
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