The ADC Diaphragm Retaining Ring for Sprague Stethoscopes can be used to replace the adult or pediatric retaining ring on a variety of Sprague Stethoscopes. Warranty: 1 Year. Note: This is the replacement for the diaphragm retaining ring only and does not include any other stethoscope accessories. Features ADC Diaphragm Retaining Ring for Sprague Stethoscopes Features Available in adult or pediatric sizes: Adult (#640-02). Pediatric (#640-02S). This diaphragm retaining ring can replace the diaphragm retaining ring on the following ADC stethoscopes: ADC Proscope 640 Sprague Stethoscope. ADC Adscope 641 Sprague Stethoscope. ADC Adscope 647 Sprague-One Stethoscope. Specifications ADC Diaphragm Retaining Ring for Sprague Stethoscopes Specifications Diaphragm Diameter Adult: 1.5" (3.8 cm) Diaphragm Diameter Pediatric: 1" (2.54 cm). Diaphragm Material: PVC. Diaphragm Type: Standard. Media and Literature ADC Diaphragm Retaining Ring for Sprague Stethoscopes Media and Literature ADC 2017 Product Catalog ADC Adscope Sprague Stethoscope Instructions for Use