Features: 1-dimensional visual indicator, high-contrast color design, the whole point of view the valve position. 2. Meet the NAMUR standard, to maximize compatibility. 3. The anti-off screws, bolts removably attached to the cover when not fall off. 4. Ambient temperature: -25 ~ 85 ℃, there is -40 ~ 120 ℃ optional. 5. The die-cast aluminum housing, polyester coating. 6. Double Connection: Double G1 / 2 "nipple (1/2" NPT, M20 * 1.5 available) 7. multiple contact terminal blocks, eight standard contacts. (There is a plurality of terminals to choose from) 8. spring loaded cam, tool to debug.