The ADC Diaphragm for Proscope Stethoscopes (#661-03) features a proprietary design that enhances acoustic response by 50% over traditional designs. Warranty: 1 Year - Defects in Materials and Workmanship under normal use and service. Note: This is the replacement for the diaphragm only and does not include any other stethoscope accessories. This can replace the diaphragm on the following Proscope stethoscopes: ADC Proscope 660 Single Head Nurse Stethoscope. ADC Proscope 661 Teaching Single Head Stethoscope. ADC Proscope 670 Dual Head Stethoscope. ADC Proscope 671 Teaching Dual Head Stethoscope. Specifications ADC Diaphragm for Proscope Stethoscopes Specifications Diameter: 1.75" (4.45 cm). Material: PVC. Type: Standard. Literature ADC Diaphragm for Proscope Stethoscopes Literature ADC 2017 Product Catalog