I'm wanting to replace my mixer tap in the kitchen with a monobloc mixer.
Will I need to use check valves with the tap tails that came with the tap?
Also what are they? (plumbing novice)
Yes. The cold water supply to the kitchen is always (or should be) mains supply, whereas the hot water may or may not be. The check valves are to prevent contamination of the cold water mains supply on the one hand, whilst preventing backflow from the cold to the hot on the other.
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