Rubber Flat Washers
Browse our extensive range of rubber flat washers for taps, plumbing fixtures, and bathroom installations.
Available in multiple sizes and materials, our rubber washers provide reliable sealing for water connections. Expert technical support available.
- ★ UK's Largest Stockist
- ★ 5 Star Trustpilot Rated
- ★ 100% Genuine Spares
- ✓ Multiple Sizes Available
- ✓ Plumbing Grade Quality
- ✓ UK Stock & Fast Delivery
Need help choosing the right rubber washer?
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What Are Rubber Washers?
Rubber washers are essential sealing components used throughout plumbing and bathroom installations. These circular flat washers create watertight seals between threaded connections, preventing leaks at tap inlets, pipe joints, and fixture connections. Unlike metal or fibre washers, rubber washers compress to fill gaps and irregularities, making them ideal for applications where flexibility and water resistance are critical.
At Bathroom Spare Parts, we stock plumbing-grade rubber washers in multiple sizes to suit standard UK tap and pipe fittings. Our rubber washers are manufactured from durable elastomer compounds designed specifically for potable water systems, ensuring long service life and reliable performance.
Pro Tip: When to Replace Rubber Washers
Replace rubber tap washers every 2-3 years as a preventative measure, or immediately if you notice dripping from tap connections or reduced water pressure. Hardened or perished rubber washers are the most common cause of tap leaks in UK homes.
Rubber Washer Size Guide
Choosing the correct size rubber washer is essential for creating an effective seal. UK taps and plumbing fittings typically use metric measurements. Here are the most common rubber washer sizes and their applications:
| Internal Diameter (ID) | External Diameter (OD) | Thickness | Common Applications |
|---|---|---|---|
| 10mm | 16mm | 2mm - 3mm | Small tap connections, shower fittings |
| 13mm (1/2") | 19mm - 22mm | 2mm - 3mm | Standard UK tap connections |
| 16mm | 24mm - 30mm | 2.75mm - 4mm | Large tap washers, basin mixers |
| 19mm (3/4") | 30mm - 38mm | 3mm - 5mm | Bath taps, large mixers |
| 25mm (1") | 38mm - 50mm | 4mm - 6mm | Toilet cistern connections, supply pipes |
To measure an existing rubber washer, use digital callipers or a ruler to measure the internal diameter (the hole in the centre), external diameter (outer edge), and thickness. If you're unsure which size you need, our technical team can help identify the correct washer from a photo of your tap or fitting.
Rubber Washer Material Types
Not all rubber washers are created equal. Different elastomer materials offer varying properties for specific plumbing applications:
EPDM Rubber
Best for: Hot and cold water systems
EPDM (ethylene propylene diene monomer) is the most common material for tap washers in the UK. It resists hot water, won't degrade from chlorinated water, and maintains flexibility over time. Ideal for standard domestic plumbing.
NBR (Nitrile)
Best for: Oil-resistant applications
Nitrile rubber offers excellent resistance to oils and petroleum products. While less common for standard tap washers, NBR is used in commercial installations or where grease contamination is possible.
Natural Rubber
Best for: Cold water only
Traditional rubber washers offer excellent compression and sealing but can degrade faster in hot water systems. Natural rubber washers are typically used in older installations or cold water applications.
Common Applications for Rubber Tap Washers
Rubber flat washers are versatile components used across multiple plumbing and bathroom applications:
- Tap Inlet Connections: Create watertight seals between tap tails and flexible hoses or copper pipes. The most common use for rubber washers in UK homes.
- Toilet Cistern Fittings: Seal connections between inlet valves, flush pipes, and cistern outlets to prevent leaks.
- Shower Mixers: Provide sealing at inlet connections and between shower components.
- Basin and Bath Waste Assemblies: Used in combination with other washers to create reliable seals at waste connections.
- Radiator Valves: Though not a bathroom application, many plumbers keep rubber washers on hand for heating system maintenance.
- Pipe Compression Fittings: Support threaded compression joints in supply pipework.
When installing rubber washers, ensure the connection surfaces are clean and free from old washer material or limescale buildup. Hand-tighten connections first, then use a wrench to tighten a further quarter to half turn – over-tightening can damage the washer and cause leaks.
Rubber Washer FAQ
What's the difference between flat rubber washers and fibre washers?
How often should I replace rubber tap washers?
Can I use rubber washers with hot water?
What size rubber washer do I need for a standard UK tap?
Are your rubber washers safe for drinking water?
Can I buy large rubber washers in bulk?
Looking for other types of plumbing washers? Browse our complete Washers, Nuts & O Rings range, or contact our technical team for expert guidance on selecting the right components for your installation.