Mid States Laboratories Inc.

Tube Changes

The need to replace the tube is something that will always
exist, although the length of time between changes will
vary from person to person due to body chemistry,
environmental conditions, and general care of the instrument. From the dispenser’s perspective, while tube-changing may not be at the top of the favorite things to do list, be assured that it is 10 times easier to do it earlier than later. As the tube ages it becomes hard and very brittle making it much more difficult to remove without breaking or tearing it. If the tube breaks, removal can be significantly more difficult and time consuming, and will generally involve the redrilling (and possibly enlargement) of the bore. In regard to gluing, we do offer the option of “no glue.” Just request this on the order form, we will leave the tube extended and you can cut and glue as you choose.


  • Hot air blower
  • Tube Reamer
  • Pliers
  • Replacement tube (possibly larger if bore was redrilled)
  • Microwave or coffee maker (for hot or boiling water)
  • Appropriate glue (based on earmold material)

Plan A – The tube has stiffened but is not “rock hard” (nor soft as when new)!

  • Hold mold in front of hot air blower (helps loosen the glue)
  • Gently pull the tube out with pliers
  • If the tube breaks, insert the tube reamer, turn clockwise to grab tube, and remove
  • Clean sound bore
  • Insert new tube
  • Pull tube to desired position and cut tip
  • Reglue

Plan B – The tube is extremely stiff / brittle

(as tubes in this condition can cause earmold breakage, chipping, or holes due to need to redrill, it is a good idea to mention this possibility to the patient prior to beginning)

  • Drop earmold into boiling water (or submerge and hold) for 3-5 minutes to soften glue
  • Proceed as above, but with care to avoid breaking
  • If tube breaks and tube reamer does not suffice, carefully redrill the bore (this acts as a “super-charged reamer” as must be done carefully)
  • Proceed as above, if bore is larger, a thicker tube may be needed

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| 600 N. St. Francis | P.O. Box 1140 | Wichita, KS 67201 | P 316.262.7013 | Toll Free 800.247.3669