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1/2 In. NPT to 3/8 In. Tube Compression. Check valve goes between Valve and tank to prevent back flow from bags through valves to tank When air pressure changes in your tank for any reason such as a leak using air tools air will bleed back from your bags threw the valves to equalize with the changing tank pressure. This check Valve is available in 3/8 In. and 1/2 in.