Faucet Aerator Adapter Kit includes six [6] adapters and washers in total: INCLUDING the three [3] most commonly used adapters and washers to adapt 15/16-Inch-27 male, 3/4-Inch-27 female and 13/16-Inch-27 female thread AND ALSO INCLUDES three [3] specialty adapters and washers to adapt to 13/16-Inch-27 male, 55/64-Inch-27 male, and 55/64-Inch-27 female Tested against American Society of Mechanical Engineers & Consumer Product Safety Improvement Act Standards. Great for most THREADED faucet mount water filtration systems and will work on MOST, not ALL PUR, Brita, Culligan, etc. sizes vary, https://www.pur.com/water-filtration/pur-replacement-adapter more details here. The most basic thing you need to know about your faucet in order to replace or add an aerator is the threading - either male or female. If your faucet has threads on the outside, it is male threaded - which means you need to buy a FEMALE threaded aerator to fit over it. Conversely, if your faucet has threads on the inside, it is female threaded and you'll need a MALE threaded aerator. If the tool doesn't fit simply request a REFUND not a return (there is a difference!)