Use of the green stopper in the calibration solution: Technical tips.

Client:
Hello, what is the purpose of the green cap that comes with the calibration solution?

Technical Advisor:
Hello, it can be used for winterizing and also during calibration if it's not possible to shut off the water flow.

Client:
Ok, thank you.

Technical Advisor:
You're welcome. Feel free to contact us again! Have a good evening.