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Premium Truck & Trailer Repair, Inc. <br /> ` { <br /> ti <br /> Day tank for Used Oil is drained daily and no Used Oil is allowed to remain in the <br /> day tank. Transfer of Used Oil from the day tank into the Used ON tank is done <br /> through pneumatic transfer. The control valve for the Used Oil day tank is closed <br /> and only opened when attached to the transfer hese allowing all of the Used Oil <br /> in the day tank to be transferred Into the Used Oil tank. <br /> Figure 2 -Used Oil Tank <br />