Designed to attach to the end of a flexible hose and then press-on to any compatible outer diameter dust hood for a quick and easy friction fit. Ideal for use with smaller capacity, mobile dust collectors to service multiple machines. Eliminates the need to connect and disconnect a hose clamp each time a new woodworking machine is used. Stays secure and airtight. D4246: Tapered male end for press-on fit Threaded end fits 2-1/2" OD flexible hose Ideal for quick connection to 2-1/2" ID machine dust ports W1038: 4-1/4" Outside Diameter - Large End 3-7/8" Outside Diameter - Small End 4" Long For quick and easy friction fit. Stays secure and airtight. ABS Plastic D4261: Tapered male end for press-on fit Threaded end fits 4" OD flexible hose Ideal for quick connection to 4" ID machine dust ports D4231: One end threads into the 2-1/2" ID dust collection hose The other end is a press-fit to the 4" OD dust collection fitting.