This allows you to be able to attach your 4-inch or 2.5-inch hose from one machine to the next without disconnecting the hose.  The female connector only is for those who have previously purchased our 4-inch male hose ports. Will not work with 4-inch or 2.5-hose ports from other suppliers.
 
4-inch and 2.5-inch male and female connectors will work with any hoses. You do not have to own our dust boot, 2.5-inch  or 4-inch male connectors as both sides are provided.