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General Hearing Instruments (GHI) tubes and domes are an essential part of your Simplicity brand open-fit hearing aids. Replacement tubes not only look and feel better but they also help your open ear hearing aids fit better. Your tubes and domes should be replaced about once every three months, for your hearing aid to work its best. G.H.I. Original Factory Replacement Hearing Aid Tubes and Domes for Simplicity Smart Touch and Simplicity Hi-Fi Hearing Aid Models. Right Ear 3 pack of Medium (2B) (Men) Hearing Aid Replacement. Model # HA-PTM-R