Dust Coupling, 4''
Allows you to connect two 4'' or 2-1/2'' fittings together without the need for additional hose or hose clamps. Example: connect an elbow fitting to a Y-fitting.4'' Coupling has 4" ID on each to accept 4" OD fittings. Plastic. 2-1/2'' Coupling has 2-1/2'' ID on each to accept 2-1/2'' OD fittings.