Over the weekend I installed the "Horst Miracle Probes" in both my gray and black tanks. First let me say that I am very impressed with the difference between the small button probe that came in the tank and the Horst probes that are about 1 1/2 inches long. The result is that now I have a monitor that really works. It was cold this past weekend and when I went to install the first probe, which was for the black tank, I stripped the brass post with the nut. Big, fat and very cold fingers will do it. This morning I emailed Horst and got a nice email back from Rita asking for my address so that she could send me a replacement for free. Yes I said for free. It was a little hard to remove the old plugs, on the gray I had to push three of them into the tank. The new one went in very easily once I licked the rubber part first, made them slide right in. I would strongly suggest that everyone who wants a working monitor change out their probes with these new probes. Their web site is http://www.rvprobes.com/buyprobes.html I first heard about them from the news letter of the Phoenix club and have seen mention of them on here. Again I thank Rita at the Horst Miracle probe company.PS I just got another email while I was typing this from Rita saying she was sending the new probe out today. Now that is what I call great service.