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17 <br /> �OR <br /> 0 a <br /> coo <br /> 24K -87 <br /> VACU CHA UN <br /> b. Are there 2 vent lines from the B20? See the green line below. One line from the B20 fill sump and one <br /> line from the B20 STP sump leading to the vent sump. <br /> 22 <br />