The TubcuT® threshold is just 4” above the floor giving you easier, safer access, the same as a typical shower pan. TubcuT® Follows the same exact contour of your tub there is no ledge on the threshold or a bulky plastic inserts. plastic inserts are just caulked in and are subject to leaking and will need service & recaulking . The TubcuT® is custom fitted to your tub creating a seamless, water proof application along with a beautiful factory appearance, The TubcuT® is the only tub to shower conversion that can be REVERSED! Save the cut out section of the tub and we can restore your tub to its original condition. great for resale purposes.