NEW / UNUSED — Oaktree Products Size 13 Thick BTE Hearing Aid Tubes. ✅Clear BTE earmold tubing. Size13 Thick / 13T BTE earmold tubing. Compatible with many BTE earmolds that use Size 13T tubing. For best hearing aid performance, BTE tubing is commonly replaced every3–6 months to help maintain comfort, fit, and sound quality.
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