Rubber washers are essential components in plumbing systems — they create watertight seals at fittings, faucets, valves, and pipe connections. Choosing the right material and size prevents leaks and extends the life of your plumbing system.
Best Materials for Plumbing Washers
- EPDM — Best choice for potable (drinking) water systems. Excellent water and steam resistance, and available in NSF-compliant grades. Ideal for faucets, supply lines, and water heaters.
- Neoprene — Great all-around choice for general plumbing. Good water resistance and compression set. Works well for drain connections and non-potable water applications.
- Fiber — Traditional choice for pipe flanges and compression fittings. Handles moderate temperatures and pressures well.
Common Plumbing Washer Sizes
- Faucet washers: typically 1/2" to 3/4" OD
- Garden hose washers: 3/4" OD x 1/2" ID
- Supply line washers: 3/4" OD x 1/2" ID x 1/16" thick
- Pipe flange washers: 1" to 4" OD depending on pipe size