A stylish pick for a modern bathroom update, the Hibiscus Thermostatic Shower Valve keeps your water temperature constant. For proper installation, requires use of volume control valve and trim. Thermostatic technology keeps shower temperature ± 1 degree Celsius. Made of solid, heavy-duty fireclay. Zinc alloy die-cast posts Smooth, ripple-resistant surface. All metal construction If purchasing drain separately, it must be able to accommodate a sink drain thickness of 1". Mounting hardware included All sink dimensions are ± 1/2".