This Harmony ZB, blue colored boot has a round shape. It is compatible with Harmony XB4 and XB5 push buttons. This single boot is ideal to complement a control unit and adapt it to stright hygiene and cleaning requirement of stringent industries. Its clear color allows users to identify it visually at a distance. It is perfectly formed-fit with Harmony push buttons and is chemical resistant, making it ideal for operation in harsh environments requiring frequent chemical cleaning. The silicon boot prevents growth of bacteria in joints and gaps: ideal for high hygiene environments like food and beverage industry.