Undermount tub rau khoom swb yog qhov kev xaiv zoo tshaj plaws rau kev tsim chav ua noj niaj hnub vim lawv cov yam ntxwv tshwj xeeb thiab cov txiaj ntsig, uas tuaj ntawm ntau hom, xws li ib nrab txuas ntxiv, tag nrho txuas ntxiv, thiab synchronous ib qho kom haum rau ntau yam kev siv.