This adaptor has five steps, 25mm, 50mm, 63mm, 75mm and 100mm outside diameter, all of which are connected by a tapered section to minimise clogging. You can either use as a whole or you can cut to a specific size with a saw. This hose fitting is made from a thermoplastic polymer, which is impact resistant, has structural strength and stiffness and will not flex or distort under pressure. It has excellent low temperature properties and will perform in extremely cold workshops down to -40°C. The internal bore is smooth to ensure the smooth passage of dust. As all of our fittings are made to exacting and tight tolerances to prevent air loss, a top tip is to use a washing up liquid as a lubricant when initially installing. ©