Potter / Amseco Potter MPEX Explosion Proof Manual Pull Station JMAC# POTTER-MPEX Explosion Proof MPEX Pull Stations are designed for use in Class I, II, and III hazardous areas. A hinged cover holds a sliding actuator plate in place. By lifting the cover and pulling down the ring, a compression spring is released, thus allowing the... MSRP: Was: Now: $949.15 Add to Cart