personally, I would steer clear of the Cull. units. Their new units are referred to as HE models and are a drastic departure from traditional designs. they use 7 separate pistons (as opposed to 2) which only serves over-complicate things and allow for more points of failure. I was less than impressed. Fleck and Clack are industry standard. Pentair makes Fleck valves and they also have other models available, such as Autotrol
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