Impact I3-P1W-AT1 Acoustic Tube Earpiece, Icom Radio (See List)

Icom IC-F3G, IC-F4G, IC-F3GS, IC-F4GS, IC-F11, IC-F14, IC-F14S, IC-F24, IC-F24S, IC-F31, IC-F33G, IC-F43G, IC-F43TR, IC-F3000, IC-F4000, IC-F3001, IC-F4001, IC-F3003, IC-F4003, IC-F3011, IC-F4011, IC-F3021, IC-F4021, IC-F3021S, IC-F4021S, IC-F3021T, IC-F4021T, IC-F3041, IC-F4041, IC-F3101, IC-F4101, IC-F3041, IC-F4041, and Bearcom BC100 two way radios.

eBay