Suggested Retail: $12.99. PHILTOP Automotive Replacement Engine Thermostats for Silverado 2500 3500 HD Classic Sierra 2500 3500 HD Classic Express 3500 2500 Savana 2500 3500 - These are PHILTOP Automotive Replacement Engine Thermostats. They are a 100% fit and made from higher quality material. The OE Replacement Number is 12600172. They have a larger piston diameter. These thermostats are fit for various models such as Express 2500, Silverado 3500 HD, Silverado 3500 Classic, Silverado 2500 HD Classic, Sierra 3500 HD, Sierra 3500 Classic, Express 3500, Savana 2500, Sierra 2500 HD, Sierra 2500 HD Classic, and Savana 3500. Brand: PHILTOP Model: 1110ECT019EUS -- LOT STICKER: TCE-BOX-BOXTCEB0483-ITEM-82f2cffb___LPNRRHM9096118 -- SIZES ARE ESTIMATED. 7 CALENDAR DAY FULL REFUND GUARANTEE (FROM PRIMARY PICKUP DATE) ON THIS ITEM IF ANY ISSUE IS FOUND THAT WAS NOT DESCRIBED/PICTURED. 7 CALENDAR DAY STORAGE (FROM PRIMARY PICKUP DATE) IS ALSO AVAILABLE. THE PRIMARY PICKUP DATE IS THE DAY AFTER THE AUCTION ENDS. SEE NOTES TO BIDDER, IN AUCTION DETAILS, AT THE TOP OF PAGE 1 FOR MORE INFO.