Description: Automatic valves for use in water circulation, zoning, air elimination and radiant heat systems; centrifugal metering pumps for use in water circulation, zoning air elimination and radian heat systems; flow regulators used in the field of domestic and commercial heating systems for use in water circulation, zoning, air elimination and radiant heat systems; pump control valves for use in water circulation, zoning, air elimination and radiant heat systems; forced hot water heating system pumps for use in water circulation zoning, air elimination and radiant heat systems; regulators being part of machines for use in water circulation, zoning, air elimination and radiant heat systems; manually operated metal valves for use in water circulation, zoning, air elimination and radiant heat systems; metal pressure vessels for use in water circulation, zoning, air elimination and radiant heat systems; metal fluid storage tanks for use in water circulation, zoning, air elimination and radiant heat systems; manually operated plumbing valves for use in water circulation, zoning, air elimination and radiant heat systems; heat pumps for use in water circulation, zoning, air elimination and radiant heat systems; gas regulators for use in water circulation, zoning, air elimination and radiant heat systems; hot water tanks for use in water circulation, zoning, air elimination and radiant heat systems