It is extremely rare for a lavatory faucet to develop a leak under the counter. Typically, leaks under the counter occur upon installation due to one of two factors.

With Quick-Snap® connections - Newer Delta widespread faucets feature Quick-Snap® installation. If you have Quick-Snap® connections and experience leaking at the connection points, Quick-Snap may not have been properly installed. Follow these steps to check the Quick-Snap connections:

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  1. Shut off water supply.

  2. Pull at the connections to see if the hoses are properly affixed. If they are not connected securely, pull them off completely and reattach them until you hear or feel a snap.

If your faucet does not have Quick-Snap connections, tighten the hose to the spout and handles using a wrench.

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Do not overtighten. Use two wrenches to tighten the copper tube to the water supply lines, located under each handle.

Leaks