longitudinally extending internal ribs 15 16 along its sides there is also a bottom cap 17 at the bottom of the tube 14 there are small apertures 18 in the bottom cap 17 for permitting liquid in and a central bearing hole 19 float 21 has a central rectangular slot 22 it also has opposed peripheral vertically extending slots 23 and 24 which receive ribs 15 and 16 as the fluid in the tank rises the fluid inside the tube cavity 27 will also rise as fluid enters holes 18 this in turn causes the float 21 to rise in the tube the float is prevented from rotation by the guide ribs 15 and 16 however vertical movement of the float in the tube is permitted as the float rises it causes a helical flat strip 28 with peg ends 29 to rotate rotation of the strip 28 rotates rotor 31 due to the tight fit of upper peg 29 in a lower central rotor bore note the rotationally permissive mounting in pivot hole 19 and in bearing 30 in the cap part 13 up from the top of the rotor 31 extends an additional peg 34 that rotates in bearing 30 inside the rotor 31 are a series of vertical bores which receive a plurality of rod.