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. The die-cast aluminum housing, polyester coating. 5. Double Connection: Dual 3/4 "NPT interfaces, up to four connection options (G3 / 4", G1 / 2 ", 1/2" NPT, M20 * 1.5 available). 6. The multiple contact terminal block, eight standard contacts. (There are multiple terminals to choose from) 7. spring loaded cam, free tool to debug. 8. proof grade: housing in line with Exd‖CT6 standards.