Quality Assurance: Well-designed, well-crafted. Not an part number, but meets part number manufacturing requirements. This is the manufacturer's replacement and is functionally equivalent to the previous part. Made of highly materials, rigorously tested, compact & sturdy, longevous. Easy to install. Electric circular saw dust collection port vacuum cleaner connection 193068-4 for N5900B 5901B 5902B Colour:As Shown Material:plastic Please confirm that the model you need to buy matches our model before ordering. This part is a compatible spare part, and the manufacturer's name and part number are for reference only. Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. Due to different batches, there may be differences in product appearance and printed text, which not affect use Package Contents: 1 * dust collection port Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.