What is the thread out of the top of a hot water cylinder?

[casaco]

I want to fit a sussex flange to a standard hot water cylinder about 10 years old, normally there is a 1inch bsp tapping, this one has a male thread out of the top with a compression 28mm to 22 mm end feed reducer, held in place by a 28mm nut and olive, it does not have a male iron to copper fitting, the threaded bit looks to be screwed directly into the cylinder but if so how can it have a 28mm compression nut to the top if the part that enters the cylinder is 1 inch bsp?

 

[Ric2013]

castle did make Cylinders with compression connections.

They did indeed!

 

[casaco]

Won't the pump manufacturer accept the Mira way of making the connection? (page 16): https://www.mirashowers.co.uk/media/1455/miras-guide-to-pumped-showers.pdf

Then you don't need a flange at all.

Hi Ric, Stuart Turner don't show this method in their instructions but I'll give them a call and ask. Thanks

 

[casaco]

Won't the pump manufacturer accept the Mira way of making the connection? (page 16): https://www.mirashowers.co.uk/media/1455/miras-guide-to-pumped-showers.pdf

Then you don't need a flange at all.

Looks like we can use option B, thanks again.