What is the minimum size of a pump shaft when the float switch is locked on the Dirty Water Pump, i.e. it is not working?

The shaft size should be at least L 40 cm x W 40 cm Classic Dirty Water Pump 6000 (1790) Dirty Water Pump 6500 SP (1792) Classic Clear Water Pump 7000/C (1661) Classic Dirty Water Pump 7000/D (1665) Dirty Water Pump 8000 SP (1794) Classic Dirty Water Pump 7500 (1795) Dirty Water Pump 13000 SP (1796) Comfort Dirty Water Pump 8500 aquasensor (1797) Dirty Water Pump 18000 SP Inox (1798) Comfort Dirty Water Pump 13000 aquasensor (1799) Premium Dirty Water Pump 20000 inox (1802)