1. Check the flexible pipe (4) for damage, scratches, and/or deformation.
– Replace it if the corrugations are damaged, scratched, or deformed.
– The flange in particular is at risk because it compresses the gasket and, in doing so, may warp the contact surface.
2. Carefully clean the contact surfaces of both the flanges.
– Avoid deforming the flexible pipe while cleaning.
– Do not damage the contact surface with sharp tools.
