Exhaust valve regulator. The valve regulator used to adjust thebehavior of the exhaust valve without tools in 5 seconds. Replaces the original trim system. The regulator is very easy to install. Lets you adjust the performance of the exhaust valve to changing ground conditions. Made of machined aluminum and anodized. Valid for KTM, Husqvarna, Husaberg and Beta 250/300 2-strokes.