What is it? Our way faucet diverter valve is all metal construction and lever switch, it can be installed on most kitchen faucets to divert water to the Countertop, RO or RO/DI unit.It came with screw in/on connector and aerator. It connects to 1/4 RO tubing and It will not affect the original pressure at all.. It can be fit for most of counter top water faucet adapter. Where to use it? To connect your counter top water purification system or Reverse osmosis system with 1/4" tubing only(Outer Diameter is about 6.5MM) directly to kitchen faucet for easy use.(Please check your Tubing size before purchasing) How to use it Just screws on to the faucet then you run separate small line to your counter top water filter.This diverter is a female fitting so your faucet should be a fitting or you buy an adapter. What you will receive? Diverter Valve x1 ★Material&Design: Premium durable solid brass make with chrome finish body and lever with 90 degree (off-on) to connect directly with any kitchen&bathroom sink that has a removable Aerator ★Measurement: M22(≈22mm) female thread on the top; Double Barb for Outer diameter 1/4 RO Tubing; with most standard size faucets or any appliance that hooks to 1/4 od plastic tubing ★Easy installation: Just take off your faucet areator and put this diverter valve on instead. And then run 2 separate 1/4 RO Tubing to your counter water filter. ★Function&Quality: Faucet Diverter valve allows you to simply divert your sink's water to your counter top water filter. Even with the diverter in place, you can still wash your hands and use the sink as normal. The diverter can be a permanent fixture or it can be removed in seconds.No drips no leaks, Solid construction with nice quality. ★Read before you buy from : Check your original faucet aerator removable or not, and then take off the aerator and measure the faucet thread . If it is M22(≈22mm) thread. then just hook up directly. If it is M24(≈24mm) female thread, then you need buy our M22 to M24 thread adapter to work with it(B089QR1K66). If your faucet is normal has no thread and Outer Diameter between 14mm to 22mm, then you can buy our Universal Faucet adapter(B089QK6ZSG) to work with it. "