Horgy
You are seeing the toggle switch seal a example part number would be Micro Switch 1TL1-3. From the 1TL1-3 Spec sheet "Sealed to prevent entrance of liquid or dust"
Some switches control more circuits and they use multiple micro-switches, a good example is Micro Switch part number 64AT34-3 In Part Number 64AT34-3 the individual micro-switches are sealed, so there is no need for the shaft to be sealed.
The landing lights are a special type of toggle switch which are made by Cutler Hammer part number A3-1092 for the two position and 8906K1592 for the three position switch
David
Boeing 737-700 flight simulator construction