Shop EPDM rubber washers in every OD, ID and thickness we stock. EPDM is excellent UV, ozone and weathering resistance — making it the go-to choice for roofing, outdoor fixtures, potable water systems and automotive weatherstripping. Rated for −40°F to 257°F. Fast shipping and bulk pricing on every order.
Not sure if EPDM is right for your job? Read our EPDM material guide for a full compound comparison, or compare all 7 washer materials side by side. New to washer sizing? See how to measure OD, ID & thickness, then shop the full catalog.
Popular EPDM uses: plumbing, HVAC and marine & boats.
EPDM washer properties
| Property |
Rating |
| Temperature range |
−40°F to 257°F |
| UV / ozone resistance |
Excellent — best of common washer rubbers |
| Water, steam & chlorine |
Excellent (incl. potable water) |
| Acids & alkalis |
Excellent |
| Oil & fuel resistance |
Poor — use nitrile or Viton instead |
| Typical hardness |
60–70 Shore A (durometer guide) |
Where EPDM washers excel
An EPDM washer is the specification for anything outdoors or in water: roofing screws (the rubber on bonded sealing washers is EPDM), faucet washers, shower heads, toilet tank bolts, garden hoses and hose bibbs, irrigation, solar mounting, and coolant systems. Its one hard limit is petroleum: oil and fuel swell EPDM — the full trade-offs are in neoprene vs EPDM.
Bulk EPDM washers & wholesale
Buying EPDM washers in bulk? Every size in this collection has automatic quantity-break pricing right on the product page — no minimums, no account needed. Contractors and OEMs ordering by the hundred or thousand can also use our bulk & wholesale program or request a quote for pallet quantities, mixed-size orders and custom-cut dimensions.
EPDM washer FAQ
Are EPDM washers safe for drinking water?
Yes — EPDM is the standard elastomer for potable water service and is unaffected by chlorine and chloramine disinfection.
What does EPDM stand for?
Ethylene Propylene Diene Monomer — a synthetic rubber whose saturated backbone is what makes it nearly immune to UV and ozone.
EPDM vs neoprene washers — which do I need?
EPDM for sun, water, steam and outdoor service; neoprene when there's incidental oil contact. Full comparison here.
Can EPDM washers be used on fuel lines?
No — gasoline and oil degrade EPDM quickly. Use nitrile or Viton for fuel service.
How long do EPDM washers last outdoors?
10+ years is routine — the same chemistry as EPDM roofing membrane, which is warrantied for decades of direct exposure.
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