About Koso/Pacific Seismic Products, Inc

Today Pacific Seismic Products is the world's leading supplier of earthquake-activated automatic gas shut-off valves and other seismic devices.

Pacific Seismic was incorporated in 1989 when it acquired the rights to Koso's seismic valves. PSP has continued to develop its gas shut- off valves by adding vertical and specialized types to its already successful horizontal line, giving PSP the most complete line of seismically activated gas shut-off valves from 3/4" to 8".
Having a complete hi-tech on-site manufacturing facility in Lancaster, CA, PSP is able to engineer, die-cast, sand cast, CNC machine and assemble their own parts and valves.

Pacific Seismic Products state-of-the-art quality control process leads the industry with high-tech, multi-stage testing of every valve manufactured, assuring you absolute reliability in a "Made In America" product.

Koso/Pacific Seismic Products, Inc

Sharon Harper,
233 East Avenue H 8
Lancaster, California 93535-1821
(661)942-4499
Access our Mobile App by texting KOSOPACIFIC to 72727
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