This video shows how to use my rv cable lubricator on both Lasalle Bristol and Valterra cables on your black and grey tank dump valves. It also shows the different air sources that can be used to pressurize the lubricator to push the lubricant through the cable. All the testing I have done has worked to free up the sticking and binding cables that are not allowing the tank valves to be opened or closed. I hope this is helpful to you, happy camping!!! My email is [email protected]. Thanks!