Hiqh quality 48mm diaphragm and 45mm rim fits most single head cardiology stethoscopes. 1. Remove old rim & diaphragm. 2. Heat new rim with dryer until soft. 3. Fit new rim on head. (use long needle) 4. Reheat rim - center diaphragm over rim use needle to stretch rim over diaphragm. Who makes this tube ? - It is made by MohnLabs. Is it as good as the original tube ? - We rate it at 9.7. Is the diaphragm tunable ? - No. Our fixed one is superior. Will it fit my stethoscope? - It fits scopes with a 7mm tube hole.
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