![](https://bsg-i.nbxc.com/uploads/a8/b0/ab/3b2d4af83214d1cf9e8657d6b0.jpg)
Mount directly on the neck of the grilles. Control the air volume from full flow to shut off. Using plastic gear to make the damper work quietly when the air flow is strong. Model: OBD-PLO meterial: steel with plastic gears lever operator type. OBD-A-PLO material: aluminum wiht plastic gears lever operator type.