To properly install a sink drain in your kitchen, first assemble the necessary tools and materials such as a wrench, plumber's putty, and the new drain kit. Next, remove the old drain and clean the area thoroughly. Apply plumber's putty to the new drain and insert it into the sink opening. Tighten the locknut underneath the sink to secure the drain in place. Connect the drain pipe to the trap and secure all connections with the appropriate fittings. Test the drain by running water to check for leaks.
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