Abstract: An adjustable height fill valve assembly for controlling water level in a storage tank, comprises a lower riser assembly comprising concentrically disposed inlet riser and an outer riser housing, each having an upper end and a lower end, the inlet riser and the riser housing connected together at the lower ends, the inlet riser being adapted for mounting in a hole in a flush tank, an upper riser assembly comprising concentrically disposed inner supply tube and an outer tubular valve housing, each having an upper end and a lower end, a main valve seat at the upper end of the inner supply tube, the upper riser assembly telescopically mounted on the lower riser assembly, a latch between the riser housing and the tubular valve housing for latching the upper and the lower riser assemblies in selected extended and retracted positions, the latch disengageable upon rotation of the upper riser assembly in either direction from a central position, a valve housing cap having a bayonet lock connection for quick connect d