All-steel case and cover provides long lasting, rugged protection for internal components Sight-set calibrated pressure adjustment displays a visible pressure scale, fully adjustable through the range without removing the cover (on NEMA 1 enclosure models) Manual reset lockout option provides trip-free lockout that cannot be overridden or reset until pressure returns to specified level Variety of available pressure connection styles allows greater flexibility when mounting control and adapting pressure connections to field application requirements