Kohler Standalone Tub design Talking about a modern bathroom, Kohler standalone tub is growing a place in people’s heart. People started to consider standalone tub or also usually called freestanding tub as a favorite type of bathtub. Standalone tub is a tub that stands alone as single furniture of bathroom that doesn’t need wall to lean on. It only needs a faucet that also functions as an accessory to beautify the bathtub. Bathroom.