Originally Posted by John68040
They make plastic t-valves for this, I've got one in my car. You cut a section in the line where it goes to the heater core and clamp it in. It's got a threaded cap, and with an adapter you can screw on a garden hose. It makes flushing the coolant nice and easy.
I have used this adapter before not once but twice..once the cap failed the other the plastic tee cracked...no disrespect intended by no means but this is why i chose my way to do it..