I run hoseless with 2 reels. One ez-snap fitting refuses to close and the other has been going for years. Changed the one that wasn't closing and even replaced the back to tank fitting. Yesterday i forgot it was left open as I couldn't snap it on the back to tank fitting and turned on both reels and flooded the back of van till I got to first job.
So decided to find out what was going wrong when I changed it again. Turns out its the lower part of the fitting which has plenty of limescale on it. Because of the plastic cover I can't get WD40 in to that part. In future I will need to remove the cover and get WD40 or Plusgas into it to keep it working.
After years of this problem I have found a simple solution, incase anyone else comes across this nightmare.