This anodized aluminum holder clamps to almost any ring stand and securely holds an ultrasonic stack using a booster having a mounting ring with a diameter of between 2.65″ (67 mm) and 3.25″ (83 mm), which is most of the standard ones.
To mount a stack, set the holder to an appropriate height on the ring stand and simply hang the stack in the holder and clamp it with the blocks.
Not using a booster? Flip the holder over and use the other side, which is a better fit for converters with diameters between 2.65″ (67 mm) and 2.99″ (76 mm) which includes almost all 20KHz converters of at least 500 watt power capability. You may also wish to consider model RS200 without the clamp blocks.
You should probably consider using two of these holders, one for the booster with clamp blocks and one for the converter/transducer (model RS200). It is possible that the reactor vessel you are using would be a good fit in that holder as well.
Made in USA of aircraft grade aluminum anodized and nickel sealed, and includes nickel-plated steel thumbscrew.