Available Accessories for electric boxes Mushroom push button head diameter 22 40mm red metal trim SCHNEIDER SCHNEIDER ZB4BC4 €13.95 Pushbutton head Ø 40/Ø 22. Product range: Harmony XB4. Device short name: ZB4. Bezel Material: 3dB 22mm mounting diameter. Round head. Operator, spring return. Round red color Ø 40 without marking. Add to basket