Introducing 4-Inch to 2-1/2-Inch Cone Reducer by POWERTEC.
This limited adapter was designed to provide you with a simple solution to coupling your 4-inch ID dust hoses with 2-1/2 ID dust hoses. Specifically, it allows you to step down from a larger main line to a smaller branch line without compromising air velocity or the effectiveness of your dust collection system.
It features a premium, heavy walled ABS plastic construction made for durability and to withstand the wear & tear commonly associated with woodworking dust collection. It's extremely easy-to-use and doesn't require messy tape or additional equipment.

Introducing the 2-1/2 Inch & 4 Inch Double Wire Hose Clamps by POWERTEC.
These clamps are designed to provide a quick and secure attachment for your dust hose to your dust collection fittings. Whether you're just starting to assemble your dust collection system or in need of replacement hose clamps – these wire hose clamps are an essential tool to connecting your piping to your blast gates, dust hoods and fittings.
Specifications
Material: Carbon Steel
2-1/2 Inch Double Wire Hose Clamp Capacity: 2-3/8” ~ 2-3/4”
4 Inch Double Wire Hose Clamp Capacity: 3-11/16"~4-3/8"
Finish: Zinc Coating