An umbrella pop-up fits to the bottom of the lavatory. It differs from a traditional pop-up style drain, in that the umbrella style requires no pop-up arm to be lifted or lowered to close or open the drain. Instead, the umbrella drain operates by simply pushing down on the drain cap to engage or disengage the closing mechanism. You may install a pop-up umbrella lavatory sink drain in with just a couple of hand tools and perhaps even limited DIY skills.
Loosen the fixtures on the lower portion of the S-trap beneath the lavatory sink. If you cannot loosen them by hand, use a large pair of slip-joint pliers to loosen the fittings. Set the S-trap aside.
Loosen the locknut on the bottom of the drain tailpiece holding the current drain to the sink, and unthread the locknut. Push the aged drain tailpiece out of the sink and wipe off any old putty that remains.
Loosen and remove the locknut and washer from the bottom of a brand new pop-up umbrella drain. Apply a layer of plumber’s putty to the bottom of the flange only if instructed to do so by the manufacturer.
Slip the tailpiece to the drain hole from above the sink, and center the drain in the drain hole. Attach the cone-shaped drier you eliminated in the prior step back onto the threads with the broad edge facing down, followed with the locknut. Tighten the locknut by hand to guarantee the drain to the lavatory sink.
Reconnect the S-trap to the drain along with the new tailpiece. Tighten the couplers by hand.
Turn the water in the sink and watch the drain assembly for any leaks.