outlet 52 to maximize the flow of water 28 through the passageway 48 the opening 64 is configured to receive a guide portion 66 in the form of a post the guide portion 66 has a pair of legs 68 formed proximate a lower end 70 that selectively lock into the opening 64 to prevent axial movement of the guide portion 66 the guide portion 66 also includes upwardly extending tapered gussets 72 that terminate in a hollow upper end 74 that is configured to receive a refill nozzle 76 and stop washer 78 that captures the valve body 34 to the guide portion 66 during a flush cycle the refill nozzle 76 receives water 28 from the supply valve 26 via tube 80 the refill nozzle 76 allows water 28 to fill a portion of the valve body 34 and tank 12 during a flush cycle to influence the duration of the flush cycle and to restore the bowl water to an initial level the substantially cup shaped valve body 34 is a type of float that is open to the ambient at a top 35 and includes an exterior wall 85 and an interior tube 86 that generally rides along the guide portion 66 during a flush cycle the interior tube 86 is substantially conical and tapers toward an upper rim 88 of the tube 86 the conical configuration of the interior tube.