Re: Slide out cylinder
Are you sure it is the seal leaking? The reason I ask is that our door-side slide cylinder was leaking. Because the end of the cylinder at the frame opening was lower than the interior end of the cylinder, we would see a drip or two of fluid at the frame end.
I knew it wasn't the seal leaking because our first warning of the leak came from a trail of hydraulic fluid leaking out of the underbelly where the water tank drain line came through after we pulled into a site with a steep incline at the entrance. I aimed my phone camera through the frame opening hole, turned on the video mode and the flash and filmed while my wife ran the slide out. I could see fluid dripping from the interior end of the cylinder. Eventually, it would run the length of the cylinder and drip off at the frame rail.
Ours turned out being the 90 degree fitting at the interior end of the cylinder. I ordered a new fitting and replaced it myself. No leaks since.