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An observation pipe may serve as a combination observation/vent pipe providing it terminates in the <br /> same mariner as required for vent pipes. See Figure 6. <br /> • <br /> ysay Itaturn I�a1 <br /> • <br /> is.,/jGro9iir • Ilstr164oa lateral <br /> •Syst.m.sICvdan <br /> Watertight cap <br /> 4"min.dia. <br /> Slot. I <br /> 6" <br /> 6"min: I� min. <br /> • <br /> Inflttrative surface 11' <br /> Water Closet Collar i3ar(3!8"min.dia.) <br /> Observation pipes <br /> 4106/ otv e ohsPr vaf,vti <br /> cxw1 l 1 cz 1 So <br /> 13e n41- Z. r.2.r above fra dla. <br /> f <br /> • <br /> I (1714,--t ei�t <br /> �f-- G S' i7. ok 11 <br /> f <br /> • <br /> 0%5, 14, <br /> n IL 3 <br /> • <br /> yM <br /> P.,� e`'Sdill <br /> ice, - 6 4 ---> <br /> • <br />