Part Type: HVAC Pressure Switch. 1983 Mack RL OE No. 4379RD546460; 4379RD559761;. 1984 Mack RL OE No. 4379RD546460; 4379RD559761;. 1985 Mack RL OE No. 4379RD546460; 4379RD559761;. 1986 Mack RL OE No. 4379RD546460; 4379RD559761;.
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