Environmentally Sealed Push buttons Series WB giros Distinctive Characteristics Freshers Single unit construction of the bushing and case gives added protection from environmental elements. sud 15 Lilliputian Specially designed contact mechanism for breaking light welds. Minimal contact bounce is achieved with specially designed interlocked switching mechanism. Programmable Outer housing of heat resistant resin reefs UL 94V-0 flammability standard and provides high arc and tracking resistance.