conductive-level-switch-NE float-level-switch-polypropylene heavy-duty-level-switch level-switch-conductive-compact-nek level-switch-dry-goods liquid-float-level-switch liquid-level-switch-side-mounted magnetic-float-switch-ncb PTFE-tethered-float-switch rotating-vane-level-switch static-pressure-level-switch tethered-float-switch ultrasonic-level-switch-nk-8000 capacitive-level-switch-ncw conductive-level-switch-cable-suspended