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Registered
Join Date: Jun 2010
Location: Bel Air, Maryland
Posts: 1,051
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If by “return valve” you mean check valve? Yes it needs to be on the vertical within a couple feet of pump. It’s purpose is to stop water going backwards through pump and causing impeller to spin wrong direction
As far as your discharge line freezing yes it will if it is not graded downhill allowing pipe to drain
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Justin
84 Carrera Targa
98 F-150 4x4
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