Our 10 Zvac Short 90 spigot is constructed with high quality materials that are made to last and also feature low internal friction which means low vacuum maintenance. This short 90 PVC spigot should be used with similar central vacuum tubing with 2" diameters. The 90 degree design allows for large objects to stop from going into your central vac system. The Short 90 should only be used at the mounting plate and should not be used anywhere outside the inlet. Replacement Compatible Fits: Aggresor Airvac AstroVac Beam Cana-Vac Cirrus Drainvac DuoVac Dustcare & all other central vacuum cleaner system brands.