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An save observation pipe may s as a combination obsetvaE n/vent pipe providing it terminates in the Y <br /> same manner as required for vent pipes. See Figure 6. <br /> v..t _ • Ft./lawn r.o aJ . • <br /> • tr. x.14:• <br /> .12-rnJe. Ili;atiiida ' <br /> . 11:tr butiaa lateral <br /> VP- <br /> Sysiam.ei mtto n <br /> Watertight cap <br /> 6"min: <br /> 4"min.dia: <br /> Slot. <br /> in <br /> min. ' <br /> 111 Infiltrative surface <br /> Water Closet Collar Bar(318"min.dia.) <br /> Observation pipes <br /> i <br /> ,4i"'e ohsPY. va4./o— <br /> en..d 1 r �, LUJ it a15o be ci I ,C t d'c 1 tit"01.1 1 7. I.2" a bove ra cP <br /> f 1 <br /> • �� im ('`w�1 t <br /> 4/� ,to.t - -� 6' I� <br /> f , <br /> lle <br /> P...-, pit lap '1'.• <br /> Mill rr, <br /> Gw 1 <br /> i <br />