Industrial Grade Buna-N Pressure Washer O-Rings for 1/4" Quick Connect Fittings- High Temperature & Oil Resistant Replacement Seals for M22 Couplers, Hoses, Wands, and Garden Hose Connectors 100/Pack

Why Your Pressure Washer Keeps Leaking—And How to Fix It PermanentlyThat annoying drip dripping from your pressure washer wand connection isn't just a minor inconvenience. Every drop represents lost pressure, wasted water, and reduced cleaning effectiveness. The culprit is almost always a single O-ring that has flattened, cracked, or deteriorated from exposure to heat and chemicals.The good news? It's also the easiest problem in the world to fix.The Science Behind the SealOur pressure washer O-rings are precision-molded from Buna-N (Nitrile) rubber, a material specifically chosen for its exceptional resistance to petroleum-based fluids and its ability to maintain elasticity under compression. When you connect a quick coupler, the O-ring compresses slightly to fill every microscopic gap between the male and female fittings. This compression creates a barrier that water simply cannot penetrate—provided the ring retains its shape.Cheap O-rings use low-grade rubber that takes a "compression set," meaning they flatten permanently and lose their ability to spring back. Within weeks, you're back to leaking. Our Buna-N formulation resists this compression set, bouncing back to its original shape every time you disconnect and reconnect. This means consistent sealing performance across hundreds of connection cycles.That's the difference fresh O-rings make. And with 100 in the pack, you'll have them ready for every machine, every attachment, and every emergency repair for years to come.Beyond Pressure Washing: Where Else These O-Rings ShineWhile these seals are engineered specifically for 1/4" pressure washer quick couplers, their utility extends across your entire property and workshop:Around the House: Stop leaks at garden hose connections, repair sprinkler system fittings, seal rain barrel spigots, and fix leaking hose nozzles. The same 3/8" inner diameter fits countless standard household connections.In the Garage: Drop them into air tool quick couplers, seal automotive fluid transfer equipment, repair shop vac hose connections, and maintain parts cleaning equipment. Buna-N's oil resistance makes it perfect for these environments.On the Job Site: Keep a pack in every service truck. When a crew member reports a leaking coupler, hand them a fresh O-ring instead of sending them back to the shop. Minimize downtime and keep projects moving.For the Homestead: Use them on livestock watering equipment, garden irrigation systems, wash-down hoses, and portable sprayers. Reliable seals mean reliable water delivery when and where you need it.The Hidden Costs of Worn O-RingsA single leaking connection can waste hundreds of gallons of water annually. That's water you're paying for but not using productively. Meanwhile, your pressure washer works harder to maintain pressure, putting additional strain on the pump and engine. Fuel consumption increases. Cleaning time extends. And the constant moisture around connections promotes rust and premature failure of expensive couplers and fittings.At less than the cost of a single trip to the big box store, this 100-pack pays for itself the first time you use it. Every O-ring after that is pure savings.What's Included in Your 100-Pack100 precision-molded Buna-N O-ringsStandard size: 3/8" Inner Diameter (9.2mm) x 14mm Outer DiameterDesigned specifically for 1/4" quick connect fittings70A durometer hardness for optimal sealing performanceTemperature range: -30°F to 250°F (continuous operation)Resistant to petroleum oils, gasoline, hydraulic fluids, and detergentsTear-resistant and abrasion-resistant formulationInstallation Tips for Best ResultsRemove the old O-ring completely and clean any debris from the groove before installation. Press the new ring into place with your fingers, working it around until it sits evenly. A tiny dab of silicone grease helps it slide into position and extends service life, though it's not required. When reconnecting, push the coupler together firmly until you feel the ball bearings click into place. Test for leaks before starting your project.For stubborn old O-rings that have fused to the fitting, a plastic pick or dental tool helps remove them without scratching the metal surfaces. Never use metal tools that could gouge the sealing surface.Frequently Asked QuestionsQ: Will these fit my pressure washer? A: If your pressure washer uses 1/4" quick connect fittings for wands, hoses, or spray guns, these O-rings are the correct size. The 3/8" inner diameter is the standard replacement size for this type of fitting across virtually all consumer and professional pressure washer brands.Q: How do I know when to replace the O-ring? A: Signs include visible water leaking from the connection, difficulty maintaining pressure, water spraying from unexpected places, or fittings that connect too easily (indicating the ring has compressed too far). If you see any of these, replacement is due.Q: Can I use these with hot water pressure washers? A: Yes. Buna-N performs well up to 250°F continuous operation, covering most residential and commercial hot water applications. For steam cleaners exceeding this range, we recommend checking your equipment specifications.Q: Are these just for pressure washers? A: While specifically sized for pressure washer quick couplers, they fit any 1/4" quick connect system with 3/8" ID seal requirements. This includes many garden hoses, air tools, hydraulic quick connects, and shop equipment.

• Precision Engineered for Leak-Free Performance：Stop wasting water and struggling with weak pressure caused by worn-out seals. These replacement O-rings deliver a perfect compression fit on 1/4" quick couplers commonly found on pressure washer wands, spray guns, and hose connections. Each ring measures 3/8" inner diameter (9.2mm) with a 14mm outer diameter, designed specifically to create a watertight seal that restores your equipment's original spraying power. No more annoying drips running down your arm or puddles forming at your feet while you work.
• Industrial-Grade Buna-N Material That Outlasts Ordinary Rubber：Manufactured from high-quality Buna-N (Nitrile) rubber, these O-rings stand up to tough job site conditions. Unlike standard rubber that cracks and flattens over time, this material maintains its shape and elasticity even when exposed to petroleum oils, gasoline, hydraulic fluids, and cleaning chemicals. The 70A durometer hardness provides the perfect balance between flexibility for easy installation and firmness for lasting compression. Whether you're dealing with hot water up to 212°F or cold morning starts, these seals keep their integrity season after season.
• 100-Pack Bulk Value for Homeowners and Professionals：Keep your pressure washer running at peak performance without frequent trips to the hardware store. This 100-count bulk pack ensures you always have a replacement O-ring ready when leaks inevitably develop. Professional contractors will appreciate having spares on hand for multiple machines and crew members. Homeowners can finally stop reusing deformed rings that don't seal properly. With this supply, you can replace every worn seal immediately, saving water, reducing pressure loss, and avoiding the frustration of equipment that won't perform.
• Versatile Compatibility Across Multiple Applications：These aren't just pressure washer O-rings—they're problem solvers for any 1/4" quick connect system. Use them on garden hose fittings to stop leaks at the spigot. Drop them into M22 couplers on pressure washer pumps and gun assemblies. Swap out damaged seals on spray nozzles, surface cleaners, and extension wands. They even work on air hose quick connects and automotive shop equipment. The 3/8" inner diameter is the industry standard size for countless applications beyond pressure washing, making this kit a smart addition to any toolbox.
• Simple Tool-Free Installation Gets You Back to Work Fast：No specialized skills or expensive tools required. Remove the old flattened O-ring with a pick or small screwdriver, press this new one into the groove until it seats evenly, and reconnect your fittings. The process takes less than 30 seconds from start to finish. The Buna-N material slides easily into place without rolling or twisting, and its natural grip holds it securely during reassembly. You'll feel the difference immediately when you pull the trigger and experience full, focused spray pressure instead of weak, sputtering output.