The 4Trade tap washer P/R is used to replace worn or degraded washers, always handy to keep as spares, to maintain a sound, leak-free join. Used to replace worn or degraded washers, always handy to keep as spares, to maintain a sound, leak free join. Used in tap connectors to create a water tight seal between the tap tail and the tap connector. Once the water is turned on and the washer comes into contact with the water, it expands, producing a water tight seal. The 4Trade brand represents trade quality and value for money. Ideal for use in many plumbing applications. Quality product. Never reuse a fibre washer - always replace with a new one.