Are you concerned that a walk in tub won?t fit into the space where your standard bathtub once stood? Don?t be ? with the exclusive Comfort Series? brand walk in tub, every detail was carefully thought out during the design phase. To ensure snug, proper fits in almost any bathtub space, the Comfort Series? designed a panel system called the Extension Kit. This panel system allows you to extend the length of the walk in tub as needed.