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TLS-250i • 7941 • <br /> ILLS-250 7942 <br /> *An Interstitial Sensor Interface Module is required for use of the Interstitial <br /> Fiberglass Tank Sensor with the TLS-350 console. <br /> ** A Two-Wire Module is required for use of the Interstitial Fiberglass Tank <br /> Sensor with the ILS-350 console. <br />