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Should the plunger valves on Model 51/52, Model 520R/530R, Model 635/636 and Model 633/634 pump be closed when the pump is not running?

model plunger valves
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Should the plunger valves on Model 51/52, Model 520R/530R, Model 635/636 and Model 633/634 pump be closed when the pump is not running?

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No, however the valves need to be closed for filter cartridge replacement.

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