What pipe sizes does it connect?

It joins a 2 x 3 inch downspout to 4 inch pipe: FLEX-Drain, standard 4 inch corrugated, 4 inch PVC and most other 4 inch drainage pipe.

Do I need clamps or screws?

The adapter slips on, but a clamp or screw at each end holds it tight and stops leaks, especially on a buried line.

Yes. It is commonly used to route downspout runoff into a buried 4 inch corrugated or PVC drain.

It bends to absorb misalignment and odd angles, so it fits where a straight rigid adapter would not line up.

Yes. The rubber body does not rust or corrode like metal adapters.

At True Value, for $4.99, 25% under what the other stores charge, as of our latest check.

16 stores we checked sell it, including Hemlock Hardware, Amazon, True Value, Healdsburg Lumber, Do it Best.

$4.99at True ValueChecked 1 h ago

25% under what the other stores charge

Compared across 15 stores. Prices are checked against each store and labelled with when.

It checks today's price at every store, compares the alternatives and answers in about a minute.