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Installation Vacuum Connections within Containment Sump <br /> 5. Measure a length of 1/4" ID tubing to connect the VAC TEST port on the Vac Sensor (labeled 'T)to the tank's <br /> interstitial 3-way ball valve. Plan enough tubing to avoid sharp bends in it or stretching it. Cut and install this <br /> tubing and secure tubing ends with spring clamps. <br /> 6. 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 /> STEEL TANK FIBERGLASS TANK <br /> 3-way ball 3-way ball <br /> 1/4" NPT valve1/4" NPT valve Relief valve <br /> barbed fitting barbed fitting (1/2" NPT) <br /> Sensor cable <br /> Spring clamp to junction box Spring clamp Sensor cable <br /> �to junction box <br /> 1/4" ID tubing1/4" ID tubing F- <br /> P <br /> to Vac Sensr Cord grip to Vac Sensor Cord grip <br /> 9 <br /> 1/4" NPT Riser cap 1/4" NPT close nipple �—Riser cap <br /> close nipple <br /> vacsensors/fig 10.eps <br /> Figure 11. Example tank interstitial sensor riser cap connections-steel and fiberglass tanks <br /> Vacuum Connections to a Double-Wall Fiberglass 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, spring clamps, and relief valve from the kit. <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 /> IMPORTANT:You must install the relief valve in the fiberglass tank riser cap or damage to the tank may <br /> occur! <br /> 13 <br />