2 1/2" TO 2 1/4" REDUCER FOR DUST COLLECTION By Peachtree Woodworking - PW449
The 2 1/2" to 2 1/4" reducer reduces in a smaller increment that normal, it only steps down a 1/4" of an inch. The reason for this is, specific machinery setups like Shop-Vac can use this fitting as a plug for the hose assembly.