Patent ID: 8505128

Claim:
A closure for a bathtub having a walk-through, said walkthrough being bound by a generally U-shaped structure having a central sill portion and jamb portions projecting upwardly and from opposite ends of said sill portion, the U-shaped structure having a width greater than that of the sidewall of the bathtub such that the U-shaped structure defines opposed, generally U-shaped protuberances respectively projecting interiorly and exteriorly from the tub sidewall, said closure comprising: an exterior insert, said exterior insert, in use, being disposed exteriorly of the U-shaped structure; and an interior insert, said interior insert, in use, being disposed interiorly of the U-shaped structure and releasably secured to the exterior insert to seal against the U-shaped structure to permit the bathtub to be filled to a height above the sill portion; wherein, in use, the interior insert is sealed in a watertight manner against the protuberance projecting interiorly from the sidewall and the exterior insert is disposed in a non-watertight relation against the protuberance projecting exteriorly from the sidewall thereby permitting leaks of the interior insert seal to be detected.