ToolCurve's 27mm hose adapter for Bosch 1617 EVS Plunge Base Router, Compatible with Festool 27mm Hose Curvetec Adapter Features Connect your compatible 27mm hose to your Bosch 1617 EVS Plunge Base Router  Twist lock design, allows you to lock the adapter on your 27mm hose  Created from a high-density plastic for lasting longevity and durability All of ToolCurve's adapters are labeled with the hose size and the tool they connect to Designed by ToolCurve in Ohio, Made in USA. We offer this adapter for additional size hoses on our website  Available sizes: 27mm, 36mm, 1-1/4", and 1-7/8" hoses