and each slot 48 ends at a blind end unnumbered slightly above the flange 46 fig4 diametrically opposite fingers 55 fig1 of a plate 56 having a centrally threaded bore 57 are slidably received in the slots 48 an externally threaded screw 70 is threaded into the centrally threaded bore 57 of the plate 56 and has a diametrically through bore 71 which receives a cross pin 72 of a length projecting beyond opposite ends of the bore 71 the bore 71 is positioned slightly above an exteriorly hexagonally configurated end portion 73 of the externally threaded screw 70 the cross pin 72 is just slightly less than the diameter of a cylindrical bore 75 of an exteriorly knurled knob or handle 76 which has a radially outwardly directed flange 77 and a hexagonal recess 78 which matches and receives the hexagonally exteriorly contoured end portion 73 of the threaded screw 70 a spring 79 is seated between the underside of the disc 65 and the plate 56 the spring 79 is provided to apply an upwardly directed force through the disc 65 against the diaphragm 50 and thus regulate the pressure afforded by the valve regulator 10 as will be more apparent hereinafter however as the knurled knob 76 is rotated clockwise as viewed from below the hexagonal recess 78 forms a drive connection with the hexagonal end portion 73 of the exteriorly threaded screw 70 to rotate the screw 70 clockwise which raises the plate 56 to thus progressively compress the spring 79 between the disc 65 and the plate 56 the greater the compression.