Part Type: HVAC Pressure Switch. 1985 Mack RW OE No. 4379RD546460; 4379RD559761;. 1986 Mack RW OE No. 4379RD546460; 4379RD559761;. 1987 Mack RW OE No. 4379RD546460; 4379RD559761;. 1988 Mack RW OE No. 4379RD546460; 4379RD559761;.
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