The Overnighter is a package consisting of our 12V fllter heater and your choice of Battery Brain. By pairing these, you can leave the filter heater on "Overnight" and arrive to a warm filter after a cold night (insulate the R90T for best results). Allows fast switching to SVO, no more high vacuum and air leaks from switching too soon with a filter that is still just too cold.
This item is not usually required until temperatures are in the teens Fahrenheit, if you have good liquid oil, but it can really improve switchover times and performance when temperatures plunge!
If the battery voltage drops to 12.5V, the Battery Brain shuts off the heater automatically. With the Battery Brain III, you get a remote that allows you to turn the vehicle battery on/off from the house. With that version, you can use the Battery Brain as the heater controller, turning on the heater to pre-warm the filter for a while (1 hour min. suggested) before starting the engine.
If you prefer a "hard wired" version, ask us to send the Battery Brain IV. Simple hard wired reset button on the dash. Your choice, same price.
Not all bowls shipped with Vormax fllters and R90T filter elements have a 9/16" fitting. Unless you pull the small plug and confirm that the outside diameter of the threaded portion of plug is in fact 9/16" you either have to drill and tap the bowl (tap is a 9/16" x 18) or buy a new bowl from us the modified bowl comes with the Overnighter.
Overnighter Vegoil Warmer 
The Overnighter is a package consisting of our 12V fllter heater and your choice of Battery Brain. By pairing these, you can leave the filter heater on "Overnight" and arrive to a warm filter after a cold night (insulate the R90T for best results). Allows fast switching to SVO, no more high vacuum and air leaks from switching too soon with a filter that is still just too cold.