Dirty Tank Float - GrapeVine Purple - for Select BISSELL Upright Carpet Cleaners. Fits Model 3748. For After Cleaning Care with the Dirty Tank Float, follow these instructions: Turn OFF and unplug machine. Pull dirty water tank up and away to remove. Empty dirty water tank. Unscrew ring at bottom of tank to remove float stack. Clean and rinse debris from float to prevent dirty water tank overflow and maintain seal integrity. After cleaning, align arrow on float with tank's notch. Twist ring to lock in place. Ensure alignment to prevent water leakage. Reinstall tank by angling it with bottom first, then tilt and push until it clicks into place. Dirty Tank Float for Select Carpet Cleaners - GrapeVine Purple 1642207