Customer Rating: Summary: Excellent design reviewed with the controller it fits 2008-03-29 Comment: This is a module to expand the capacity of the Rain BirdŽ ESP Modular Irrigation Controllers. The controller supports four automatic valves when installed and three additional modules (this item) can be installed to increase capacity to thirteen valves.
Installing this unit is fingertip easy. It slides on generous rails into place and the lever visible in the product image is swung into the 'locked' position to hold it there.
Very good design. Recommended. See also my review of the controller itself.
Garden 
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