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Weathermatic 12000 Series Valves feature superior materials, four-bolt covers, an unmatched manual bleed, a shock cone to reduce water hammer and a revolutionary reverse flow design which prevents valve failure in the open position. Excellent for micro-irrigation as valve will operate as low a 1 GPH. The unique "reverse flow" porting design permits equal pressure distribution
on both sides of the diaphragm, regardless of line pressure providing zero stress to prevent "stretching," a common cause of valve failure.