Pictured are two air intake / exhaust pipes for an underground bunker. They are build out of 8-inch schedule 40 pipe with 8-inch flanges. The design is one such that pouring liquids or explosives down in the intake will result in the materials being redircted to a diffuser where the liquids leak out or the blast is dissapated. I have two of these, and they are sold separately. I have the listing marked as local pickup only, but I may consider delivering for a fee. I’ll post a video below, and don’t hesitate to ask if you have any questions. Each unit is about 13ft long, and I speculate likely weigh about 300lbs. If you would like to call or text my phone number is (318) 272-0951. Here is a video: