Air valves for steam heating installations; faucets for pipes; gas apparatus, regulating and safety accessories; level controlling values in tanks; spigots; purification installations for sewage; regulating accessories for water or gas apparatus and pipes; regulating and safety accessories for gas appparatus; regulating and safety accessories for gas pipes; regulating and safety accessories for water apparatus; safety accessories for water or gas apparatus and pipes; sanitary apparatus and installations; level controlling valves in tanks; thermostatic valves as parts of heating installations