The RIDGID VT1755 (31743) 3-Piece Hose Adapter Kit for Wet/Dry Vacuums is designed to connect different sizes of vacuum hose, wands, and accessories. The 2 1/2 in. to 1 7/8 in. Adapter connects 1 7/8 in. accessories to a2 1/2 in. hose, while the 1 7/8 in. to 1 1/4 in. Adapter connects 1 1/4 in. accessories to a 1 7/8 in. hose. The Hose-to-Hose Connector joins two 2 1/2 in. hoses at the ends to provide extended reach. In addition, the 2 1/2 in. Adapter and 1 7/8 in. Adapter can be combined to connect 1 1/4 in. accessories to a 2 1/2 in. hose.