[Safe material]:Water dispenser valve made of PP, you can use it with confidence. [Size and Applicable]: Only fits 55mm Crown Top Non Threaded Water and not works for the 48mm screw type lid. Suitable for 1-5 gallon from all . [Reusable & Multiple Uses]: Using instead of smaller bottles money and leave less to be recycled! Perfect for office, school, camping, sport events, etc. [Easy to Use and Anti-dust Cap]: With a dust-proof cap, it can prevent dust from polluting the drinking water, healthy.Easy to install, just press it into the bucket mouth and rotate clockwise till it's fully fixed.