The “California Valve” manufactured by Paciļ¬c Seismic Products (formerly Koso) includes the most complete line of mechanical earthquake valves on the market today. Valves are offered in multiple orientations (horizontal, vertical up, vertical, down), sizes (3/4 through 8”) and pressure classes (7 psig and 60 psig max). All valves are UL certified, approved by the State of California and are manufactured in accordance with ASCE 25-06. MBS trained team are experts in installing these types of automatic gas shut-off valves in commercial and residential buildings.