The overflow for these types of appliance is already featured so there is no requirement to make a provision for this. Eltham Plumbers can install all types of appliances. Below is a brief guide to fitting a waste outlet for a basin, with the old one already removed.A new waste fitting should be fitted into the basin with the correct rubber washers, however if you dont have them, this joint can be completed by following the guide below:1). Place a ring made of plumbers mate or silicone rubber to the underneath of the part of the waste fitting that is fitted in the basin outlet. The appliance needs to be dry for the best result otherwise any jointing compounds that you use used will not adhere to the porcelain. 2). Position the waste fitting and place a second ring of plumbers mate, silicon or a large rubber washer around the threaded area that is visible at the hole in the appliance. Now fit a 32mm polythene washer.Lastly:Fit a large back nut on the fitting, which will compress and seal the fitting. Make sure the fitting doesnt turn when tightening the back nut by putting two screwdrivers through the slots in the fitting to hold it still. An Eltham Plumber can fit basin waste fittings.When the appliance complete you can carry out something called the: Second FixThis fix makes sure that the appliance is level, fixed securely, and supported, and all fixtures are reconnected correctly. Dont worry about the slope for the waste as it is set in the design of the basin.