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plumbing - What stops water from stagnating in a gutter drain line that has a pop-up emitter? - Home Improvement Stack Exchange
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NDS 4 in. Pop-Up Drainage Emitters 6-3/4-in L x 6-in W x 4-in dia Emitter in the Outdoor Drainage Accessories department at Lowes.com
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Amazon.com: NDS 422G 4" Pop Up Drainage Emitter with Elbow, 4 Inch, Color may vary : Patio, Lawn & Garden
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Drainage 101: The Benefits of Using Pop-Up Emitters | Landscape maintenance, Backyard drainage, Drainage
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