- proof for products of explosion group IIA with a maximum experimental safe gap (MESG) > 0.9 mm and an maximum operating temperature of 60 °C.
- Mainly used as equipment of fixed roof tanks for venting and inbreathing to prevent undue pressure resp. vacuum and undesired losses of vaporization, respectively undue emissions.
- Installation on top of storage vessels.
- Available with an explosion and endurance burning proofed condensate drain device.