Abstract: Apparatus and a process is provided for restricting that portion of the flow of water which is directed through a tube to refill the bowl of a toilet after a flush. Typically, the bowl refills before the toilet tank fills so that some water overflows the bowl and is wasted down the sewer. Accordingly, a conduit is connected to the discharge of the bowl refill tube. The conduit has a tapered bore which diminishes continuously from its inlet to its outlet. The diameter of the bore at the conduit's outlet does not permit sufficient water to discharge and refill the bowl after a flush. The conduit is formed of material which is readily cut. An objective bowl water is established. In a process of progressively trimming back the outlet of the conduit, an ever larger and larger diameter bore is exposed, increasing the amount of water discharged.