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Installation Vacuum Connections within Containment Sump <br /> Vacuum Connections to a Double-Wall Vapor Return Line <br /> Repeat steps 1 - 2 of the Product Line connection instructions for the vapor return line connection, except: <br /> • Install the 1/4" NPT barbed fitting in the vacuum termination port of the vapor return line (see Figure 10), <br /> • Connect one end of the tubing to the vapor return line barbed adapter and the other end to the barbed fitting on <br /> the bottom of the plastic valve that is connected to the Vac Sensor/Vac Float pair you labeled V. Plan enough <br /> tubing so that it isn't stretched between fittings or have any sharp bends/kinks in it. Cut and install this tubing <br /> and secure tubing ends with spring clamps. <br /> Vacuum Connections to a Double-Wall Containment Sump <br /> Repeat steps 1 - 2 of the Product Line connection instructions for the sump interstice connection, except: <br /> • Install the 1/4" NPT barbed fitting in the interstitial space access port provided in the sump's wall (if multiple <br /> ports are provided, select the lowest one). <br /> • Connect one end of the tubing to the sump interstice barbed fitting and the other end to the barbed fitting on <br /> the bottom of the plastic valve that is connected to the Vac Sensor/Vac Float pair you labeled 'S'. Plan enough <br /> tubing so that it isn't stretched between fittings or have any sharp bends/kinks in it. Cut and install this tubing <br /> and secure tubing ends with spring clamps. <br /> Double wall <br /> TO STP product line <br /> to dispensers <br /> 1/4" NPT port in vacuum line <br /> vacsensors/fig9.eps termination fitting (may contain <br /> Schrader valve) <br /> Figure 10. Example vacuum termination fitting-double-wall pipe <br /> Vacuum Connections to a Double-Wall Steel Tank <br /> NOTE: Double-walled tanks must provide access for installation of a liquid sensor at the lowest point of the <br /> interstice. <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 /> 12 <br />