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Vacuum Sensor System Installation Guide Vacuum Connections within Sump <br /> t OVac Sensor <br /> Cable pair t <br /> junction box <br /> Barbed elbow <br /> 1/4ID tubing to product' <br /> line 3-way valve Vac Float <br /> Figure 10. Connecting vacuum tubing from product line 3-way ball valve barbed tilting to a Vac Float <br /> Vacuum Connections to a Double-Wall Steel Tank <br /> 1. Get the tank's interstitial riser cap, interstitial sensor, cord grip components,3-way ball valve, 1/4" NPT close <br /> nipple, 1/4" NPT/barbed adapter fitting,and spring clamps from the kit. <br /> 2. Assemble the cord grip components and apply sealant to its threads.Screw it into the 1/2" NPT hole in the <br /> cap. <br /> 3. Slowly lower the steel tank interstitial sensor into the tank riser until it rests on the bottom of the riser. Push the <br /> end of the sensor's cable through the loosened cord grip in the cap-being careful not to lift the sensor off <br /> bottom.Apply sealant to the threads of the riser pipe and screw on the cap until tight.Tighten the cable cord <br /> 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. Measure a length of 1/4" ID tubing to connect the VAC TEST port(see 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 /> 11 <br />