American Standard M922991-0020A 1.0GPM Male Pressure Compensating Faucet Aerator

Genuine American Standard faucet replacement part 

Male threaded aerator 15/16-27UNS

1 gpm /  3.8 L/min maximum flow rate

Flow rate delivers 55% water savings (when compared to standard
2.2 gpm)

Pressure compensation provides a constant flow throughout the entire pressure range

This lead free faucet part complies with CA AB1953 and VT S152