The 51757 is a 50 ft. (15.6m) tapered hose, which changes diameter from 32mm (1.25") to 35mm (1.375") over the length of the hose. This allows for the hose to work with different sizes of tool attachments. The hose is silver in color. The crushproof vacuum hose is ideal for commercial and domestic vacuum applications including dry, wet-dry, central vacuums, extraction equipment, and as a general use vacuum hose demanding excellent flexibility and a smooth interior for superior air flow. The 51757 hose accepts threaded vinyl cuffs and bent ends making it immediately compatible with commercial vacuum equipment, central vacuum inlets, and standard vacuum wands, both metal and plastic.