I am replacing a laundry room sink and the problem i have is the sink is 1 1/2in piping and the drain is 1 1/2 in as well the pipe in the floor is flared out onto the concrete but there is not a flare inside the pipe to take the pipe. the pipe in the floor appears to be lead. I have tried plumbers epoxy which held well until i attached the trap and it just fell over. Any ideas on how to attach the sink to the drain pipe in the floor without any leaking???