Brasscraft Sf0053X DualThread Polished Brass Faucet Aerator 15/16"-27 male thread and 55/64"-27 female thread Max flow rate: 2.2 GPM/8.3 LPM Polished no-lead brass for a durable high quality appearance No-lead certified Aerator style: Slotless 15/16"-27 male thread and 55/64"-27 female thread Max flow rate: 2.2 GPM/8.3 LPM Polished no-lead brass for a durable high quality appearance No-lead certified Aerator style: Slotless New California state legislation prohibits sale of product in this state