4" RECTANGULAR BELL DUST PORT By Peachtree Woodworking - PW390 4" Rectangular Bell Dust port sets up similar to a flange. Generally used on larger machines such as the table saw or joiner. The long neck allows for a 4" hose to be secured in place A hose clamp is required for proper connection. (HOSE CLAMPS SOLD SEPARATELY) Measures 9-1/2" long by 4-1/2" wide.