A: A Safe Tub modification involves cutting out and removing a section of your existing bathtub to reduce the threshold making it easier and safer to step in and out of the bathtub. Safe Tub modifications can be done with nearly all bathtub types. Traditional bathtubs are manufactured using cast-iron, steel, porcelain, and fiberglass. Contact Safe Tub Access at 281-724-4443 for more information on converting your tub to a safe step through shower!