Guzzler Replacement Diaphragm - Buna N (FDA-approved material) for G400 or G500 modelsAn FDA-approved version of Buna-Nitrile. Excellent resistance to water, petroleum oils and fuels. Good resistance to aliphatic hydrocarbons, acids and bases. The temperature range is -40°F to +212°F, intermittent to +230°F. Poor resistance to ozone, sunlight or weather.#13 in diagramGuzzler Replacement Flapper Valves - Buna N for G500 modelMost economical and versatile valve; fabric-reinforced; easily pumps...