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- Oct 21, 2015
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- Scottsdale, AZ
Thanks! They’re check valves, they make sure the liquid only runs in one direction. Typically they’re used on pumps to make sure a back siphon doesn’t occur, thus draining water from the tank (or on the other side, draining all your additive into the tank). That large, bulky, dark grey plastic piece on the flexible tubing of my return pump is also a check valve that does exactly that, only a much larger one . The ends of my dosing lines are actually above the water level (unless I temporarily shut off my return pump and the sump fills up), so I don’t necessarily need to worry about a back siphon. For my application, I used them to try to prevent air bubbles from forming in the primed dosing lines.Nice nice! What are the white things on your dosing lines? And what do they do ?