This blast gate is designed for extraction systems where more than one machine is linked to the dust extractor. To maintain the optimum air flow you simply close off the blast gate to machines not in use. Both ends are 100mm outside diameter for connecting to industry standard 102mm internal diameter dust hose. You can fix the blast gate to a wall using the optional R8525 blast gate brackets.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. ©