Filling filters and tank filler necks with breathers from the SMBB series made of metal/steel for mounting on hydraulic tanks and containers. Allows permanent venting while protecting against contamination entering the system. Cap diameter either 47 or 80 mm. Bayonet version with three-hole or six-hole connection as per DIN 24557-2. With high-quality STAUFF zinc/nickel coating. Options, accessories and spare parts such as pressurisation, filling screens, dipsticks, air filter elements, adaptors, adaptor sets.