Heater Core Shut-Off Valve

I just unhooked mine at the firewall and looped the pump with the intake.......WHAT a difference! Coooooool baby........

BUT, if you want it to be optional, you need the valve........as the previous writer said, a 3 way will be best.....just like on an RV water heater.......you close off the 2 lines, and open the center for cool cab and free flowing coolant......then close the center and open the 2 lines for heat......

Not sure what they have for something like this.....you're gonna have to look at the selections and THINK..................Seems to me that Prestone or someone used to sell such a thing, as well as flushing valves.........could be wrong.....