How to install a vessel sink

Position the sink

Position the sink on the countertop. If your sink has one, position the mounting ring over the drain opening and place the vessel on the ring. Other sink models may require a bead of silicone sealant to seal the sink to the countertop.

Insert the drain flange and end piece

Apply a bead of plumber’s putty along the underside of the drain flange to the drain fitting. If the drain comes with a foam or rubber gasket, place it on the underside of the drain flange.

Insert the end piece of the drain fitting down into the drain opening of the sink and through the cutout in the countertop. If the drain flange is labeled, position it so the label is vertical when looking into the sink from the front.

Note: It is best to install the drain before inserting it into the sink.

Attach the end piece

Apply pipe joint compound to the rubber gasket. From the bottom of the sink, slide the gasket around the drain end piece and all the way into the countertop cutout. Screw the friction ring onto the end piece, followed by the fastening nut. Hand tighten the mounting nut as far as it will go, then use needle nose pliers to tighten it a little tighter. Be careful not to over tighten as this can damage the sink. Double check the alignment of the drain fitting and labeling to make sure it is still straight. Wipe away any excess putty around the drain flange with a rag.

Complete the drain assembly

Connect the trap to the sink drain spigot with a slip nut and washer so that it is just snug. Install a siphon arm between the trap drain and the drain pipe in the wall or floor using slip nuts. The siphon arm must have a slight slope to the drain pipe. Depending on the configuration of the drain and the location of the branch opening, you may need to add an end piece extension and/or cut the trap arm to size with a hacksaw.

Check the fit of all drain parts and then tighten the sliding nuts further by hand or with tongue and groove pliers. Many slip nuts do not require pliers. Be careful not to overtighten the nuts.

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