The Ames 6000HMB Reduced Pressure Zone (RPZ) is designed to thread on to a fire hydrant for temporary water usage. The body is made of stainless steel and features a one cover design. Water meter is integrated into the device for usage monitoring. Modular check assemblies thread into body. The relief valve sets directly below the cover and uses an external sensing line. Relief valve cover designed for anti-theft. No special tools are required for servicing.