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Measure at least 1 inch down from the rim of the sink and mark the spot.
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Select a hole saw to match the size of your drain fitting. Keep the drain size to 1 inch or smaller. Drill the hole carefully.
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Apply a liberal amount of plumber's putty to the underside of the drain attachment and feed it through the hole. Screw on the bottom side until it fits tightly and the putty starts to extrude from the fitting. Wipe away the excess putty with a damp cloth.
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Attach the hose to the drain fitting and seal it with a hose clamp. Repeat this step on the drainpipe with the auxiliary drain joint.
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Pour a glass of water directly into the drain to test it. Watch the pipe as the water drains and feel every fitting to ensure that there is no leakage. If there are leaks, tighten the screws. Apply silicone caulk to each joint as an added protective measure, if desired.
