Sonagas Replaces 500 Gas Cylinder Valves Weekly as Consumer Group Warns of Expired and Leaking Cylinders in Angola Sonagas, a subsidiary of Sonangol, stated on Wednesday that leaks in cooking gas cylinders are primarily caused by improper handling during transportation, rather than manufacturing defects or filling processes. The company disclosed that it replaces more than 500 gas cylinder check valves each week as part of routine safety and quality control measures. According to Pedro de
![]()
