Secure screw connection for protecting flange connections on gas pipes from unauthorised disconnection has nuts fitted with sleeves with outwardly-projecting collars which fit into grooves on inside of sleeves

摘要

The secure screw connection has nuts (9, 11) fitted with sleeves (10, 12). These have outwardly-projecting collars (19) which fit into grooves on the inside of the sleeves. An Independent claim is included for a tool for releasing the connection.