Replaced my PHH yesterday and all the advice on the FAQ was used and invaluable in getting the PITA servicing done. As a novice I wanted to submit my two cents on the job. Taking the top bolt off of the tube going into the block was critical, its near the rear of the block and accessable from the top of the engine compartment. I used silcone tubing that I could only find from a Peterbilt parts distributors, but most big rig truck dealers appear to carry silicone. Pliers or vise grips to rip out the cotter pin clamp coming from the metal tube appear to be the only way for me to get that clamp off, also using a sharp box cutter to remove the rubber hose is a good recommendation. Once the old stuff was out my main difficultly was aligning the metal tube up with the engine block orifice to push the silicone tubing on. Putting the silicone tubing in boiling water and KY jelly makes it more manageble. The main tool that I found that worked best for this step was a long piece of PVC pipe cut to lenght and padded a little on the front with tape to use leverage and properly align the metal downtube and more importantly get enough leverage to push the silicone tubing from the metal downtube onto the engine block tube. The PVC pipe made this jobe a hell of a lot easier and I recommend it if you find that you are too big or too tired to get enough leverage to align and push the tubing on to the engine block orifice. I want to thank everyone for their advice, I would have never had the confidence with out their writeups to do this on my own.