Especially designed for diesels exhaust stacks and other very small locomotives. This special bottle is designed so that the smoke fluid can be dispensed precisely into the smoke unit, and can be used for any application requiring precision filling. The ultra-fine needle point requires just a small amount of pressure to release the smoke fluid. The custom 45 degree bend makes filling easy from the side of the locomotive and prevents overfilling. NOTE: THIS IS AN EMPTY BOTTLE, READY TO FILL WITH YOUR FAVORITE SMOKE FLUID.