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<br /> <br /> <br />Vent Plug <br /> <br />All systems must have . vent plug in the discharge piping. <br />The vent plug should be dose to the cylinder to get maximum <br />pressure on system IICtUatJon. "must also face up or out. <br />Facing it down will make the vent inoperative. <br /> <br />. Example 1 <br /> <br />VENT PWG <br />11984 <br /> <br /> <br />FIGURE 57d <br /> <br />SUPPLY <br />PIPE <br /> <br />. Eumple 2 <br /> <br />UNION <br /> <br />FIGURE 58d <br /> <br />SUPPLY <br />PIPE <br /> <br />1d <br /> <br />VENT PWG <br />11984 <br /> <br />