Introducing the 3M Littmann Diaphragm for Littmann Electronic Model 3100 Stethoscope, Gray. This diaphragm is a replacement part for the Littmann Electronic Model 3100 Stethoscope, and is made of high-quality materials for reliable and long-lasting use. The gray color is easy to spot and allows easy identification of the replacement part. This diaphragm is easy to install and helps ensure accurate readings, making it a must-have for healthcare professionals.