An arrangement for access to the external cylindrical/barrel shaped surface (16b) of a gasket (16) in flange connections in a piping installation in which the piping installation comprises flange halves (1, 1') of the type in which a gasket (16) is positioned between the flange halves (1, 1') and the gasket (16) is designed to seal against seating surfaces (2a, 2c) formed by annular grooves (2, 2') in the opposite end faces of the flange halves (1, 1'), and where annuli (22, 22') are defined by the end faces (16c) of the gasket (16) and the grooves (2, 2'), which thereby seal along the inner and outer periphery, and where at least one groove (14) runs from the annular groove (2, 2'), essentially in the radial, outward direction.
