This new stainless steel flow cell was developed for intensive ultrasonic processes of small volumes. The flow cell fc2clampk fits industrial ultrasonic processors UIP500hd (20kHz, 500W), UIP1000hd (20kHz, 1kW), UIP1500hd (20kHz, 1,5kW), and 2000hd (20kHz, 2kW). Its high energy input into the liquid-processing medium and its small volume make the fc2clampk a useful tool for the nano, pharma, and biotech industries. The new flow cell has simple geometries and can be disassembled and wiped out. There are no small orifices or hidden corners.