2006 Peterbilt 385 OE No. 650442BSM; 652578BSM;. 2007 Peterbilt 385 OE No. 650442BSM; 652578BSM;. 2008 Peterbilt 385 OE No. 650442BSM; 652578BSM;. Part Type: HVAC Pressure Switch. Switch, Pressure Switch.
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