Emtech Laboratories Behind-The-Ear Earmold HW TRS - Plastic Lock Tubing for Hearing Aids (Invisiear)

Some lock tubing have a lock at the top of the tube... that pulls out easily and doesn't seal as well as this stuff. This is the tubing with the lock that'll be embedded in your soft mold, seals better, and doesn't pull out. I'm adding it to my Subscription list.