"Comes in this 3/4" and also 1" (different item code) size and easily replaces the connection at the top of the hot water cylinder. Provides an air free supply for pumps at the top and normal connection at the side (both 22mm). Design alows the side connection to point in any direction. Very easy to install and you don't need to drain the cylinder at all. Never had a problem with one."
"This flange works really well and got me out a hole when I couldn't get a bush out the top of a cylinder, do remember it is 3/4" (so you may need a 1" to 3/4" bush!). It is really well priced as well and performs well."