Sanctuary Shower Enclosure Walk-In Tubs feature a industrial strength acrylic walk-in tub paired with an industrial strength acrylic shower enclose that fits on top of the tub. This combination makes construction and renovation much simpler because you have a complete shower and bathtub unit ready to go - and what's more - one that provides safe, easy access! This unit is not freestanding, but rather an insert that requires framed walls on all enclosed sides.