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Vacuum Sensor System Installation Guide Vacuum Connections within Sump <br /> 2. Assemble the cord grip components and apply sealant onto its threads.Screw it into one of the 1/2" NPT <br /> holes in the cap. <br /> 3. Install the fiberglass tank interstitial sensor into the tank riser following the instructions accompanying the <br /> sensor(manual P/N 576013-617). Once installed, push the end of the sensor's cable through the loosened <br /> cord grip in the cap -being careful not to alter the sensor's position.Apply an adequate amount of sealant to <br /> the threads of the riser pipe and screw on the cap until tight.Tighten the cable cord grip. <br /> 4. Apply sealant onto the threads of one end of the nipple and screw it into the 1/4" NPT port in the cap.Apply <br /> sealant to the other end of the nipple and screw on the 3-way ball valve.Apply sealant to the threaded end of <br /> the barbed adapter and screw it into the side port of the 3-way ball valve. (see Figure 11). <br /> 5. Apply sealant onto the threads of the relief valve and screw it into the other 1/2" NPT hole in the cap. <br /> QIMPORTANT: Don't omit relief valve in the fiberglass tank installation or damage to the tank may occurl <br /> 6. Measure a length of 1/4" ID tubing to connect the VAC TEST port (ref. Figure 12) on the Vac Sensor labeled <br /> 'T'to the tank's interstitial 3-way ball valve. Plan enough tubing to avoid sharp bends in it or stretching it. Cut <br /> and install this tubing and secure tubing ends with spring clamps. <br /> 7. The Vac Sensor labeled 'T',and which is connected to the 3-way ball valve in the tank interstice riser cap,must <br /> be wired together with the tank interstice liquid sensor in the junction box. Locate the ends of the Vac Sensor <br /> cable labeled'T'and the tank interstitial liquid sensor cable,tape them together,and tag them 'Tank Vac <br /> Sensor'. <br /> 13 <br />