07 967 454 now u s pat no 5 326 869 and 08 008 190 now u s pat no 5 282 281 owned by the assignee of the present invention vacuum subatmospheric pressure within vacuum transport conduit 166 is communicated via vacuum hose 168 to vacuum inlet 96 in sensor controller 164 a surge tank 170 with a check valve may be interposed in vacuum line 168 in accordance with u s pat no 4 171 853 to prevent residual sewage within vacuum transport conduit 166 from entering sensor controller 164 sensor pipe 172 extends through the top of sump pit 160 into valve pit 174 by means of sleeve 176 cap 178 positioned on top of sensor pipe 172 provides a nipple 180 for operatively connecting sensor pipe 172 to inlet port 118 of sensor controller 164 by means of pressure hose 182 in order to deliver hydrostatic pressure thereto from sump pit 154 the float valve 250 of the present invention is shown in fig9 it comprises a cylindrically shaped housing 252 made from a suitable material such as 4 inch pvc pipe housing 252 is open at the bottom and has mounted to its top surface a flat 4 inch cap 254 also made from pvc plastic attached to aperture 256 in cap 254 is slip adaptor 258 with.