A chestpiece of a stethoscope is disclosed herein. The stethoscope chestpiece includes a chestpiece body portion with an elongate recess disposed therein a rotatable acoustic valve assembly rotatably disposed in the elongate recess of the chestpiece body portion, the rotatable acoustic valve assembly being selectively positionable between a first operative position and a second operative position and configured to regulate the transmission of sound waves through the chestpiece of the stethoscope, the rotatable acoustic valve assembly including a rotatable body portion with a circumferential groove formed therein and a pin positioned within the chestpiece body portion, the pin configured to prevent an axial movement of the rotatable acoustic valve assembly within the chestpiece body portion by engaging with the circumferential groove of the rotatable body portion. In one or more embodiments, the stethoscope chestpiece includes a substantially transparent non-chill ring disposed on a diaphragm or bell thereof.
