*PLUMBERSSTOCK EXPERT* responded:
Hi! Thank you for asking about our DuraVent 3PVL-60B 3060B 3" x 60" Black Pellet Vent Pipe! Yes, this 3PVL-60B is a double wall pipe and does indeed have twist lock ends. If you want to purchase this M&G DuraVent 3PVL-60B, simply click the "Add to Cart" button, enter your zip code, and proceed to checkout. Thank you for visiting PlumbersStock.com! Have a great day!