3 way valve ds injector

I’m trying to set up a 3 way valve so I can flush my ds injector with water when I’m not pulling chem. My question is, from where do I pull the water? Do I run a PVC reducing T between the tank and the pressure washer or do I just run the tubing into the buffer tank?

If you want to skip the build just drop your d’s into a bucket of water. Or just pull the line out of the Chem tank/ bucket and let it suck in air.

Run tubing into tank. Nothing fancy

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