Lockable filling filters and tank filler necks with breathers from the SMBL series made of metal/aluminium for mounting on hydraulic tanks and containers. Allows permanent venting while protecting against contamination entering the system. Option for protecting the cap against unauthorised opening. Key included in the delivery. Clamping version, for screwing on or push-to-connect with female thread. Options, accessories and spare parts such as filling screens and air filter elements.