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The Lead Free • Apollo Model DUCLF4N (4NLF-300) Dual Check Valve prevents backflow by either backpressure or back-siphonage from a cross-connection between potable water lines and substances that are objectionable, but not health hazards. Proudly made In the USA.Lead Free • AB 1953 certifiedCorrosion ResistantReplaceable Check ModulesAvailable In Standard And Swivel Connections100 Percent Manufactured in USA