Rubber tap washers are another popular choice for sealing many types of bath and sink taps. When it comes to longevity and function in tap washers, rubber is considered to share many of the properties of nylon, although overall it is a much softer and more pliant material. This can mean that it creates a more effective seal against certain harder materials, or where there is more surface irregularity. This 20mm washer is for use with both hot and cold standard sink and basin taps. Loose per each.