The pressure cooker with the double leak-prevention seal ring is characterized in that the metal rim (5) is mounted in the center of the rubber gasket(4).
锅构成双重防漏密封圈高压锅其特 征在于胶圈（4）中心安装了有孔金属圈（5）。
2
The frame is designed to at least partially encompass a biplate when mounted in a bipolar battery, and include means to permit gas passage through the gasket.