The flexible hose (143787-2), 1” x 39”, has a convenient length and diameter for optimal dust extraction when used with the Makita 18V X2 LXT Lithium-Ion (36V) Brushless cordless 1/2 gallon HEPA filter backpack dry vacuum (Xcv05, sold separately). the Xcv05 is a powerful and portable clean-up solution that eliminates extension cords that trail corded backpack vacuums. The flexible hose is an ideal accessory and is built with high-quality materials for longer service life.