The Dust Medusa is here! Our 4" to 2-1/2" multi-port splitter helps route your 4" dust collection system to your array of power tools that utilize the smaller 2-1/2" diameter. The main end fits inside standard 4-inch dust collection hose–clamp it for a secure seal. The branches work both ways–they accept standard shop vac accessories on the inside diameter, and the outside accepts standard 2.5-inch dust collection hoses. Plan on expanding your system? Get more branches than you need–we include caps to close off all or as many of the ports as you need.