Schneider Electric ZB4BA79 flush/flush double-headed pushbutton Ø22 without cap. This Harmony XB4, double head without cap operates with a spring return / impulse mechanism. This double head is supplied without cap to allow users to customize control functions with desired caps for their machines operations. It is easily installed and replaced on compatible complete push button units and contact blocks via snap-fit assembly. It is impact resistant, dust resistant, water resistant and vibration resistant thanks to its IP66. It has a metal bezel, this makes it Ideal for applications requiring high impact and vibration resistance. It is designed to fit in a standard 22mm cutout, ensuring compatibility when installing in pre-existing machinery. Its wide range of operating temperatures from -40°C to 70°C allows versatility in usage of product. Official Schneider characteristics include Range of product: Harmony XB4; Product or component type: Head for double-headed push-button; Device short name: ZB4; Bezel material: Chromium plated metal; Mounting diameter: 22 mm; Head type: Standard; Sale per indivisible quantity: 1; Shape of signaling unit head: Rectangular. Harmony XB4 devices use a chromium-plated metal bezel and are designed for robust panel operation where clear manual control, indication or machine safety interfaces are required.