Installed a set of these with a Grunfos circulating pump last week and all was straight forward and assembled easily. I tested the shut off valves without the pump and they stayed tight and dry. Seem to be thick and well made I would use them again.
By 45 unit maintenance man (from El Sobrante, Ca.) on 07/20/2016
These flanges are swivel type, meaning the valve can be rotated to accommodate the installation. Since pumps have a groove in their flange for the rubber O-rings, these (rings) can be used instead of gaskets. In other words, both would work.
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