Replacement Select-A-Vents are a quick and easy way to control low-frequency amplification when using custom-fit earpieces. Each Select-A-Vent tree contains one of each vent size: #1 (.125" / 3.175mm), #2 (.110" / 2.794mm), #3 (.080" / 2.032mm), #4 (.050" / 1.27mm), #5 (.025" / 0.635mm) and #6 (solid plug).
