Overview This optional adaptor is designed specifically for use with Rotax engines for hooking your CarbMate / SynchroMate to a 912 or 914 series Rotax Aircraft Engine. The 2 x hoses are both 6 feet long. The connection points to each carburetor are easily made at the crossovertube between the two intake manifolds (separating the carbs duringsynchronization). When one side of the crossover tube is removed, you are left with a maleelbow and a female hose. The inside diameter of the hose is 11mm or 7/16? This way, one carb is hooked to the CarbMate at the elbow on the intakemanifold, and the other carb is hooked up at the hose on the compensating tubewhich is hooked to the other intake manifold.