Hello, has anyone fitted a new gate valve in the pipe from the header tank to the hot water cylinder? I had a go yesterday, but it appears that the pipes are so stiff that they cannot be moved enough to slide out the old valve, so I will have to undo the union to the header, remove the pipe from the header tank, then slide the pipe up the inch or so to remove the old valve.
Even if the header tank is empty, there are still overflows and inlet pipes attached which are all fairly solid looking, so it looks like there is not enough play to get the pipe up a little bit.
Any tips to do it, or should I just drain off, then remove the upper part of the pipe to allow fitting of the new valve?
Ta Alan.