Here is a tip for the lubing the cables for the dump valves on our rv's, I took a piece of gas line hose with a hose clamp on the handle end to create a good seal, drilled a small hole in the hose to insert cable lube nozzle, slide hose over handle stem clamp down handle side of hose, insert lube nozzle into hose and then push hose firmly toward rv to create a good seal then start the lube process, inserted a picture what I have and now the cable works smoothly, note second clamp pictured toward rv not needed as shown, hope this will help folks out without having to replace expensive and time consuming repairs to there dump valves...