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The Bard 8603-028 is an OEM pressure gauge used on Bard GV series heat pump equipment to help technicians verify operating pressure during startup, troubleshooting, and routine service. Built with a 1/4 inch MPT connection and a 0 to 100 PSI range, this gauge provides a quick visual reference to support accurate system checks and proper performance. Use this genuine Bard replacement when the original gauge is damaged, leaking, or difficult to read, and confirm compatibility by matching your unit model and the required pressure range before ordering.