Built-in fan design: The fan inside the sprayer can lower the water pressure, is splash-proof, and can help save water by 40% to 70%. The water temperature shouldnt be higher than 60 degrees; doing so will result in the nozzle coming off. Size? Only applicable to round head faucet diameter (16 ~ 22 mm), You can adjust the tightness freely. You can adjust the size according to the faucet size. Please check whether your bathroom or kitchen faucet meets the requirements before purchasing. If you dont understand, please contact us by email.Tap Extender Sprayer, Makes the normal water flow into sprayer form like a shower which helps in cleaning greater area at the same time and in the same amount of water