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Regulator Rebuild Kit for 12-841,12-842, 12-881, and 12-887 By-Pass Regulators. Includes complete diaphragm, spring and rebuild instructions. Menu HomeAll ListingsAbout usContact Us Holley 12-823 - Fuel Pressure Regulator Service Kit click to enlarge Description Regulator Rebuild Kit for 12-841,12-842, 12-881, and 12-887 By-Pass Regulators. Includes complete diaphragm, spring and rebuild instructions. Diaphragm Included: Yes Spring Included: Yes Spring Quantity: 1 Quantity: Kit: "> Component Typ...

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