About 18 months and many many toilet charges ago, when I had the toilet removed to replace the seals on the EZ Slide Valve (the second time in less than a year), I generously lubed all the moving parts (except the handle) with Dow Corning 111 Valve Lubricant and Sealant. It works beautifully. The valve still slides like it did when I lubed it, and there has been no seal deformation. Highly recommended. I think it is designed for use in valves under very high pressure, so while it may be overkill in this application, it seems like a sure-fix. I don't think you'd be able to lube it adequately without taking apart the valve, so it's probably not for everyone.
It has roughly the consistency of Neosporin....maybe even petroleum jelly. It comes in packets, toothpaste-sized tubes, and caulking tubes IIRC. I got the toothpaste-sized tube for ~$15 (I think on eBay), and it will undoubtedly last me as long as I have the trailer.
Dave
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2000 2720SL & 2007 3124KB
2005 Toyota Sequoia
Twin Battle Born 12v 100Ah LiFePO4 (BBGC2) batteries, 300W solar on rear shell, Link 10, Lift kit, Maxxis 8008 225 75/R15 E tires
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