Filling filters and tank filler necks with breathers from the SMBP series made of metal/steel for mounting on hydraulic tanks and containers. Allows permanent venting while protecting against contamination entering the system. 80 mm (3.15") cap diameter. Push-to-connect version. With high-quality STAUFF zinc/nickel coating. Options, accessories and spare parts such as pressurisation, filling screens, dipsticks, air filter elements, adaptors, adaptor sets.