Infinity Tools 4" to 2-1/4" Eccentric Reducer

It adapts a 4" hose down to a 2-1/4" shop-vacuum hose or fitting, so you can connect full-size ductwork to a smaller port. Browse more dust collection fittings.

The large end measures 3-15/16" O.D. x 3-11/16" I.D., and the small end measures 2-1/4" O.D. x 2" I.D.

Yes. The 4" end is sized to fit inside the port on the 115-311 blast gate, making it easy to integrate into an existing 4" duct run.

An eccentric reducer is offset rather than centered, so one side stays flat. This is useful when the fitting needs to sit flush against a wall, cabinet, or machine surface.

Yes. The 2-1/4" end connects to a 2-1/4" shop-vacuum hose or fitting, letting a shop vacuum tap into a 4" hose or port. See compatible dust collection hoses.

The large end has a 3-15/16" O.D. and 3-11/16" I.D., which is sized to connect with standard 4" hose and 4" fittings.

The small end has a 2" inside diameter and a 2-1/4" outside diameter, matching common 2-1/4" shop-vacuum hoses and fittings.

Yes. It is one of many adapters, elbows, and gates used to build a complete shop network. Explore the full dust collection selection to plan your runs.

Air can flow in either direction, but it is most commonly used to step a larger 4" line down to a 2-1/4" connection at a tool or accessory.

You can mix and match reducers, T-fittings, and elbows from our dust collection fittings range to route hose anywhere in the shop.