ULT-SP-20 is a splitter for the ULT-2000 Series Ultrasound Leakage Testers.
Watch the demonstrational video on how to perform an ultrasound leakage test on GE Probes 6VT-D, 6Tc and 6Tc-RS:
How to perform an ultrasound leakage test with a SonoSite transducer: