Dual Thread Aerator. California flow rate compliant product for lavatory faucets, 1.2 GPM (gallons per minute) at 60 psi (pounds per square inch) and kitchen faucets, 1.8 GPM at 60 psi. 55/64" x 27 Female x 15/16" Male.WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer, and birth defects or other reproductive harm. For more information go to