This plastic adaptor flange allows Comet London cold water and mixer taps to be used in tap holes with a minimum diameter of 33mm.
It fits over the threaded body of the tap and the existing tap flange sits in a recess in the adaptor.
Note: the flange on the nut supplied with the Comet London cold water tap is only 39mm wide, so is not suitable for fitting to 39mm tap holes.