Connecticut Electric 20A Single-Pole Standard Trip Packaged Replacement Circuit Breaker For Zinsco Fastenmaster Heavy-duty brass hex nuts are

Heavy-duty brass hex nuts are easy-to-grip and nickel-plated for durability

Buna-n O-ring

The tool storage box connects with other PACKOUT system components via integrated locking cleats and has an IP65 rated weather seal to protect tools and accessories from rain and other jobsite debris

Easy installation behind static gable louvers

Connecticut Electric 20A Single-Pole Standard Trip Packaged Replacement Circuit Breaker For Zinsco Fastenmaster Heavy-duty brass hex nuts areZinsco replacement circuit breakers are of a unique design that only fit into load centers (no longer made) that may be labeled Challenger, Sylvania, or Zinsco.