Heated valve jackets from Pik Rite are designed to protect valves from freezing in cold weather by circulating engine coolant through a jacket in front of a valve on any truck. Easy-to-install TTMA flanges allow for universal mounting. They are available in steel and stainless steel materials as well as 3-, 4- and 6-inch sizes. 800/326-9763; www.pikrite.com.