The MAC 57 Series is guided by our 200 Series 3-way balanced slide valve (which means this large 3-way valve can also be ordered for the 200 Series Dangerous Place version as a pilot - give it the same standard). This is a very flexible valve: 1. It can be converted to vacuum use. 2. Just rotate the function plate between the pilot valve and the main valve body to switch from normally closed function to normally open function. 3. It can also be converted into a remote pneumatic valve by removing the pilot valve assembly of the solenoid valve - just to name a few. Information about certifications (e.g. CL, CSA, RoHS and CE)