ADC ADSCOPE 641BK SPRAGUE RAPPAPORT STETHOSCOPE 22" BLACK TUBING. Features a threaded chestpiece drum of chrome plated zinc permitting the use of five interchangeable chestpiece fittings - an adult and pediatric diaphragm, and three bells (1-1/4", 1", 3/4") - for complete diagnostic capability on most patients. Latex-free double tube configuration, plus a valve mechanism that eliminates acoustic leakage.