Profile: MB Services Inc. specializes in providing installation services for automatic gas shut off valves. Series 300 & 400 gas breakers are easily installed on gas meters immediately after (downstream of) the outlet or bypass tee. This product protects against commercial gas line breaks on in-house piping. These natural gas valves can only be installed vertically. Gas breaker series 120 appliance valve can be installed in a vertical or horizontal position on appliance gas line flex connectors, or on CSST manifolds. Series 90 & 150 appliance valves & series 300 & 400 meter valves must be installed in a vertical position (within 5 degrees). Typical gas loads are included so that the system designer may utilize the lower flows & pressure drops generally incorporated in gas systems. Fire fighter's seismic valves work on a simple, consistent, and accurate principle. Each valve is tested & certified before leaving the factory to meet approval.