Check the listing for details. GENUINE OEM MACK DIESEL TRUCK 185° COOLANT THERMOSTAT 657GC324B P85 WEIR-STAT. Condition: New. Listed at 13.50 USD. NEW OEM MACK 185 DEGREE THERMOSTAT. USA MADE BY WEIR-STAT. MACK P/N 657GC324B-P85. WEIR-STAT P/N 4R315-32C5161PLEASE VIEW THE PICTURES AND CONTACT ME WITH ANY QUESTIONSFREE SHIPPING! (FREE SHIPPING APPLIES TO UNITED STATES ADDRESS ONLY) EVERYTHING THAT WE SELL IS ON-HAND AND IN STOCK, SHIPPED FROM CENTRAL USA. MOST ITEMS SHIP WITHIN ONE BUSINESS DAY. WE SHIP EVERY DAY MONDAY THROUGH FRIDAY UNLESS THERE ARE SPECIAL CIRCUMSTANCES. WE PROMISE AN HONEST, FAST AND COURTEOUS TRANSACTION! THANK YOU VERY MUCH AND HAVE A WONDERFUL DAY! JOE&BRIDGET.... please check out our other listings.Defective items are always free to return. Other returns accepted for unopened/ unused/ uninstalled merchandise only, which may incur a restocking fee to cover the cost of the original "free shipping".