Part Type: HVAC Pressure Switch. 1995 Mack MR OE No. 4379RD4191;. 1996 Mack MR OE No. 4379RD4191;. 1997 Mack MR OE No. 4379RD4191;. 1998 Mack MR OE No. 4379RD4191;. 1999 Mack MR OE No. 4379RD4191;. Switch, Pressure Switch.
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