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Pressure Washer O-Rings for Seal Couplers & Disconnect Hose Fittings 3/8" Quick Disconnect O-Rings for Chemical and Water up to 175°F (79°C). Replacing the o-rings in a pressure washer nozzle since rubber o-rings eventually deteriorate. We offer many compounds to meet your specific needs. Changing your o-rings in a timely manner saves you the continual messy water leaks, loss of maximum water pressure, and unnecessary water use and costs. FKM (Viton®) rubber has excellent resistance to high temperatures, ozone, oxygen, mineral oil, synthetic hydraulic fluids, fuels, aromatics and many organic solvents and chemicals and provides excellent resistance to a wide variety of chemicals, weather and compression set requirements. The relatively high level of fluorine in VITON® materials allows for exceptional resistance to chemical attack, but with limited low temperature capabilities in water, up to 175°F (79°C). FKM (Viton®) - Chemical and Hot Water up to 175°F (79°C)