"I only needed new fibre seals to refit my immersion elements into a new hot water cylinder as the elements were only a few months old. However I could not buy the seals s a separate item and so purchased two blanks just to get the seals! The blanks are solid items and it is useful to have them should I ever need to remove either of the elements and continue to use the cylinder."
"Because a "professional" plumber cross threading the original immersion heater into the hot water tank. I was unable to install a replacement immersion heater but of course i only found that out having removed the original immersion.
So now faced with a rather large hole in the tank and nowhere to get a new tank I had only one choice but to blank off the hole.
This blanking plug is made of Brass and is robust and after a number of attempts I was able to get it to bite the thread and screw in properly.