Hello, Used Moto purchased equipped with single Scottoiler Vsystème grease, we quickly see that the chain lubrication is not correct. With the dual injector the problem is corrected and the chain lubrication is much more effective. A little tricky to adjust, but once done, the difference is clearly seen on the chain and I think the O-rings will appreciate. If you hesitate again, not made more, the product is really worth.