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The NDS 9P09 is a PVC fitting that joins a 3 in. x 4 in. rectangular gutter downspout to 4 in. DWV or Schedule 40 pipe. It is solvent-weld on the hub end and slips over the downspout, so it belongs in buried, non-pressurized drainage runs, not in pressurized lines. Its 5 psi working limit and PVC Type I body put it in the same class as other molded drainage adapters; the value is in the exact 3x4-to-4 in. transition, which saves cobbling together reducers. Molded in the USA and made to applicable ASTM standards.
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Lowest price we've seen: $16.40 on Nov 12 at Amazon. Tracked across 1 store since Nov 12.
The NDS 9P09 PVC Downspout Adapter transitions from a 3 in. x 4 in. downspout to 4 in. Drain Waste Vent (DWV)/Schedule 40 (SCH40) pipe. It connects directly to drain pipe and carries water from a rain gutter downspout into the drainage system, so it can be released downstream.
It is made of PVC Type I material and molded in the USA. It makes a downspout x hub connection and meets applicable ASTM standards. It is for non-pressurized underground sewer and drainage applications, with a maximum working pressure of 5 psi.
