Square D (Schneider Electric) 9001KU17 Push Button Switch. Schneider Electric Harmony Protective Boot, Series: 9001KU, For Use With: Selector Switch, 30 mm, Silicon Rubber, Clear. Additional Description: SQD -9001KU17 30MM CLEAR BOOT FOR SELECTOR SW TYPE K. Catalog Description: Square D,30MM CLEAR BOOT FOR SELECTOR SW,30mm,Clear,Direct,Harmony,Protecting operators in very dirty environments or severe hose downs.,Protective Boot,Standard knob.