MDF® Sprague-X Redesigned Sprague Rappaport Stethoscope with Adult, Pediatric, and Infant Convertible Chestpiece The MDF® Deluxe Sprague Rappaport X Stethoscope with X-configuration dual-lumen acoustic tubing is the most advanced Sprague Rappaport used by healthcare professionals. Similar to the MDF® 767 Sprague Rappaport, it is five stethoscopes in one for a full range of diagnostic applications and is traditionally trusted to detect faint heart sounds and murmurs. The innovative, patented X-configuration tubing eliminates the rubbing of traditional Sprague Rappaport dual tubing that can cause acoustic interference. Healthcare professionals can assess adult, pediatric, and infant patients using this classic, versatile design. The handcrafted zinc-alloy dual-head convertible chestpiece is precisely machined for high performance and durability. Full-rotation dual-output acoustic valve stem with green indicator dot allows the user to easily identify the active sound channel. Using the included accessory kit, the adult and pediatric diaphragm assemblies can be removed and replaced with adult, pediatric, and infant bells.