Joins OD pipe to OD pipe. The 4 inch butt joint band exhaust clamp is a simple and effective way to connect heavy-duty exhaust system components such as pipes, muffler tips, and catalytic converters. Exhaust coupler clamps are repairable, durable, and reusable. can be used to repair exhaust pipes. Wrap exhaust heat wrap over the exhaust pipe on the clamp to ensure a complete seal. Distributes clamping force evenly across the entire 360 degrees to provide a tight seal and prevent leaks and prevent exhaust pipe distortion. Butt joint exhaust sleeve flange welding makes installation or disassembly easy and . Material: stainless steel band, zinc plated flange bolt and nut, steel gasket, aluminum alloy I-beam block. Note: There is a flat face and an arc curved face on the I-beam block, please place the arc curved face towards the exhaust pipe, make sure you get a tight seal. Fitment: Perfect for exhausts, mufflers, downpipes, headers, collectors. No damaging distortion to the pipe or flex