Niagara's Dual-Thread, Pressure-Compensating, Lead-Free Needle Spray Bathroom aerators are an innovative water-saving solution designed to accommodate both male and female applications. Niagara's faucet aerators save money on water and energy by producing forceful streams at a reduced flow rate that minimizes the amount of energy needed to heat hot water. The Lead-Free Aerator is constructed entirely of ABS poly which is completely lead-free for safe drinking water. Furthermore, these aerators come with special install keys to easily switch between male or female threaded faucets without the need for additional tools.