Exhaust flange for welding. For retrofitting the exhaust systems of the PX125 class with a diameter of 37mm. Due to the O-ring and the integrated clamping is a very good seal and secure the exhaust system on the exhaust port of the cylinder. Some manufacturers of tuning cylinders take it here with the tolerance on the exhaust port not too accurate, so we recommend to check the fit on the respective cylinder used before mounting. The included O-ring made of FPM material is resistant up to 240°C, against oils and fuels. When processing the exhaust flange, the O-ring should not be mounted, as high temperatures occur during welding.