Ventis 6" x 12" Black Pipe Length (Single-Wall Black Stove Pipe)This pipe is perfectly round and perfect fit pipe to pipe with the use of butt welding and precision end forming technology. What's Included Pipe Length Features Fume free finish Scratch resistant and rust free Heavy duty 22 gauge, cold rolled steel Perfectly round, perfect fit pipe to pipe with the use of butt welding and precision end forming technology The industry's first slip connector with Gap Collar solves the problem of unsightly, leaky gaps