Sub-Zero Refrigerator Compression Nut 3520380

Is This the Right Part?

Common Symptoms

• Localized dripping or seepage around the water-line fitting
• Water pooling beneath or near the refrigerator after the water supply is opened
• Restricted or interrupted water flow to the connected water or ice-making system if the connection is loose or improperly assembled

Check Before Replacing

• Turn off the refrigerator water supply before inspecting the connection.
• Visually inspect the compression nut, compression sleeve, tubing end, and mating fitting for looseness, damage, displacement, or visible leakage.
• Dry the connection, restore the water supply cautiously, and observe for renewed seepage without disassembling the fitting while pressurized.
• Confirm that the tubing is properly seated and that the compression nut has not been overtightened; Sub-Zero installation guidance specifically warns not to overtighten and directs checking all fittings for leaks.

Pro Tip

Part Details

Installation Notes

• Shut off the refrigerator water supply before installation or service.
• Place the compression nut and sleeve on the water line before fastening the line to the mating compression connection.
• Purge the water line before the final connection to remove installation debris.
• Do not overtighten the compression connection.
• Turn on the water supply and check all water-line fittings for leaks before returning the refrigerator to normal operation.

Verified Compatible Models

611G-3, 632-3, 642-2, 700BF/I-2, 532, 590, 611, 650

Fitment reminder: Match the complete appliance model number, including suffix or revision where applicable, before ordering.