Stethoscope Tips

How to Install a Stethoscope Diaphragm and Retaining Ring

Featuring our MD One® Stainless Steel Dual Head Stethoscope in S.Swell

To put your MDF® stethoscope diaphragm and retaining ring on the chestpiece, take your diaphragm and retaining ring and insert the edge of the retaining ring onto the edge of the chestpiece. You’ll feel it set in the ridges.

Using your thumb, work the retaining ring around the edge of the stethoscope chestpiece. If the diaphragm lifts up on top, carefully tuck it underneath the retaining ring and back into place.

If your diaphragm and retaining ring are separated, first install the stethoscope diaphragm into the ring. Place the retaining ring with the shorter ridges facing you. The larger ridges will be on the outside of the chestpiece. Hold the MDF® stethoscope diaphragm with the logo facing out and insert the edges of the diaphragm into the short ridges of the ring, facing out. If you are having difficulties getting the stethoscope retaining ring to be flexible enough and it seems too stiff, check out the below method, using warm water to soften the retaining ring. This will make it more pliable and easier to install, but be cautious when using warm water as it has the potential to burn. Your water will not need to be this hot. You may also warm the ring with a blowdryer.

To place the stethoscope diaphragm into the retaining ring, warm up the ring to make it more flexible.You can warm up the retaining ring in a cup of warm water or using a blow dryer. Make sure to completely dry your retaining ring if you are using warm water, before installing the diaphragm.Slide the stethoscope diaphragm into the ring and make sure the diaphragm is secure without any edges peaking out.To install the assembled retaining ring and diaphragm onto the chestpiece, place the lip of the ring under the edge of the chestpiece. Continue to press the ring along the edges of the stethoscope chestpiece, until it snaps into place.You’re all set. If you need more stethoscope diaphragm and retaining rings, or other free stethoscope parts, MDF Instruments® stethoscopes come with a Free-Parts-For-Life Program. Click the button below to order free stethoscope parts.

Register your MDF Instruments® Stethoscope, Sphygmomanometer or Reflex Hammer to become eligible for our Lifetime Warranty, Lifetime Calibration Warranty and Free-Parts-For-Life Program.




With you for LIFE!

MDF Instruments® is committed to not only providing the best sound quality stethoscope for medical professionals and the best personalized designs, but we are here for you when your beloved sunflower stethoscope deteriorates on you! All of our stethoscopes have a Lifetime Warranty which covers stethoscope parts such as stiff and hardened tubing, missing ear tip holders, chest piece parts and other issues you may run into while using your MDF®.

View Details

How to Remove the Non-Chill Ring from the Chestpiece of a MDF® Instruments Stethoscope

It's a great idea to change out your stethoscope parts every once in a while to keep them fresh and hygienic.

View Details

How to install a Non-Chill Ring from the Chestpiece of a MDF® Instruments Stethoscope

Has your non chill ring become dirty or cracked? All the free stethoscope parts you need are offered under our Free-Parts-For-Life program! Your non-chill ring is a protector for the low frequency side of your stethoscope. When examining patients, having a cold touch from the chest piece is prevented with the non-chill ring.

View Details


Sign up to receive 10% off your first purchase!