The double wall tee was a perfect fit for our wood stove. Our stove is rear venting, we thought about getting the double wall elbow. But I ordered the tee section instead. After seeing the construction of the Dura-Vent tee, I would recommend the brand and product. I especially like the access at the bottom that allows me to clean out any debris I scrub out of my chimney, instead of it ending up in my stove. Thanks Dura-Vent and Northline for a good product, great service, and quick shipping.