1.Tough, flexible rubber construction, high temperature resistance, corrosion resistance and strong sealing.2.Replacing the washers will create a better seal and help prevent leaks for the future.3.Intended for use in, pipe, valve, hose nut and other plumbing repair or retrofit applications.4.Can prevent or pipe from leaking and provide positive shut off, stopping the leak saves both and energy.5.These rubber flat washers can be used in temperature range from -4℉ (-20°C) to 212℉ (100°C) provide long-term use for your plumbing needs.