I rebuild Harrison and Ranco heater control valves for automobiles 1940-1969.  I use all new neoprene parts where necessary. Valves are disassembled, bead blasted, cleaned, and straightened when necessary. I reassemble and protect the valves with a clear coat. All work is done on site.  I also have new valves from 1950-1975 for all makes of automobiles and light trucks. NOTE: The Everhot valves (manufacturer), which usually have silver or cadmium plated tubes are not rebuildable.