Features: Special locking mechanism , requiring a tailor-made key to open the lid Unique coupings, conventient replacement for the meters inside the meter/ballcock assembly is lcoked where it passes through the meter box to prevent it from rotating during installation. Highquality ball cock shut off valves without rising headparts which can cause leaks. Standards Compliance ISO4064 Class B for horizontal installation Application the meter boxes are designed to protect the water meter from unauthorized access and damage the meter boxes are suitable for use in heave traffic situations working conditions water temperature: <40C water pressure: <1.6Mpa