Imagine the letter “h” in lower case. You have 2 lines at the bottom, and 1 at the top. With a 3 way bypass valve/solenoid, add the 1 to the 2, which gives you 3, hence the words, “3 way bypass”. Now, if you are running a heat exchanger along with an interchiller, only one of them can receive coolant going through your supercharger at a time So, let’s say the left side of the letter “h” is going directly to your interchiller coolant lines, which utilizes your vehicle’s AC system. It’s basically a straight shot from the output of your supercharger’s coolant line to the interchiller. Now, let’s say you do not want to use the interchiller, and want to use your heat exchanger to cool down your coolant from your supercharger. If you buy the 3 way bypass, you will receive a toggle switch (on/off), and possibly a relay already wired up to go to your battery. With the 3 way bypass connected to your vehicle’s positive battery terminal, and the negative wire grounded appropriately (follow the instructions provided with the 3 way bypass valve/solenoid), and connected to your toggle switch located wherever you decide to install it inside your cabin, the valve can be a positive charge or negative charge depending on the valve/solenoid. Stay with me here. So, everything wired correctly to provide power to the 3 way bypass valve/solenoid, we will use the toggle switch’s “On” position for the fluid to go directly to your interchiller. Now, the toggle switch’s “Off” will deactivate the 3 way bypass valve/solenoid, which then closes the interchiller coolant line and sends the coolant through your heat exchanger only. The word “bypass” means exactly that. Depending on the position of your toggle switch, the internal valve/solenoid will block off 1 of the 2 flowing direction from the letter “h”. If you have an additional coolant tank installed for use with the interchiller, you’ll want the outlet coolant line from your supercharger to go through the coolant tank before it reaches the 3 way bypass valve/solenoid.