Sealing systems for high pressure applications that provide electrical isolation between joined elements as well as enhanced resistance to leakage of media during a fire. With such a structure, a lubrication structure for a transmission capable of holding an oil level at a proper level with a simplified structure can be provided. Each contact module includes first, second, third and fourth contacts and a ground contact. Faster response times might be expected from increasing oxygen concentration, but a small increase in concentration can lead to a significant increase in peak burn temperature which negatively impacts catalyst life. The same number of nozzle arrays is communicated with each of the common liquid chambers, and each of the common liquid chambers is communicated with at least one of the plurality of the common liquid chambers at a portion different from a portion communicating with the liquid supply port.