a faucet fitting system having interchangeable components useable in both single handle and dual handle faucet fixtures . the component system is designed to allow the same putty plate with breast plate , waterway spout , aerator and mounting nuts to be used with the various escutcheons , metering valves and waterways associated with the single handle and dual handle faucet fixtures . specially constructed water valves , putty plates and escutcheon constructions useable in conjunction with the system are also disclosed .