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A single row of modules will require a total of four sleeves (two on each end).
The UFO stopper sleeve is designed to snap onto the UFO universal module clamp. When the stopper sleeve is attached, it converts the module clamp into a bonded end clamp. These are used on the ends of your panel rows to fasten the end modules in place.
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We'll custom design this system for you and calculate how many solar panels you need to meet your goals.