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Actually the sample valve is there to bleed the system. There is always air in the hose, so before we run the pump we can open that valve and bleed the air out of the system. We do also use it if we want to take a sample during a transfer.

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On the picture of your pump you posted on the article I noticed you have a sample valve attached to it. I never thought of doing that. Are you using it to take both hot side and cold side samples when transferring?

Thanks!

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