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This high-performance kitchen and bath faucet aerator can reduce bathroom sink water use by 77%. It only permits a flow of 0.5 gallons of water per minute, it is dual-threaded with 15⁄16 x 27 threads outside and 55⁄64 x 27 threads inside, and the housing is constructed of solid brass with a polished chrome finish. The spray pattern is a vertical needle spray. This aerator meets or exceeds ASME standards, and is California Energy Commission certified. They have a 10 year guarantee.
Niagara 0.5 gpm Faucet Aerator N3205N - pack of 12 - B00F6AJ690