Check the listing for details. Military 5 ton heater core 2540-00-020-8591 M939 5 ton M923 M923a1 M923a2 M925. Condition: New. Listed at 224.00 USD. Up for auction is a new production heater core for the m939 series 5 ton trucks. The curved orientation as shown in picture is like the OEM units for the 5 tons. These are brand new production not old surplus. These are mfg'd by an ISO 9001:2015 certified manufacturer. This is a new production part and is not a Chinese pickup truck heater core “might fit” kit without a bleeder port and incorrect inlet and outlet routings like some of the others listed. This comes with the 1/8” bleeder genuine Parker Hannifin petcock to ensure all air bubbles are purged when installed on your truck. Buy with confidence. Need other 6x6 parts let us know where we can help you 5076762972 Jim on the web at Army 6x6 LLC. Shipping price listed is for continental US only. If for export please email us for shipping quote.