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The Campbell Hausfeld 1/4-inch NPT safety valve (GR0006) is designed to replace a 140 PSI, 56 SCFM valve. This essential safety device activates when pressure in an air compressor tank exceeds a pre-set level, releasing the excessive pressure and keeping the tank from rupturing. This Campbell Hausfeld genuine replacement part is designed for use on certain Campbell Hausfeld air compressors and may also fit other brands of air compressors. Refer to your owner’s manual to see if this safety valve fits your air compressor.