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A very common connector used in installations where a home is being converted to PEX. This connector allows 1/2" PEX to connect to compression fittings on fixtures, such as a kitchen sink, with the common 3/8" OD size. This is a straight style stop valve. Remember, OD is an "Outer Diameter" measurement, which is why it appears larger than the 1/2" PEX side of the fitting. Most kitchen sink faucets now have Flexible Water Connectors built in with 3/8" OD fittings. However, there is a lot of diversity in fixture connections and you can never count on something being "common." A very common connector used in installations where a home is being converted to PEX. This connector allows 1/2" PEX to connect to compression fittings on fixtures, such as a kitchen sink, with the common 3/8" OD size. This is a straight style stop valve. Remember, OD is an "Outer Diameter" measurement, which is why it appears larger than the 1/2" PEX side of the fitting. Most kitchen sink faucets now have Flexible Water Connectors built in with 3/8" OD fittings. However, there is a lot of diversity in fixture connections and you can never count on something being "common." This stop valve is a "quarter turn" valve, which last longer than the older style shutoffs which had an internal compression washer that would go bad.