Surrey Flange question

[markdraper]

I have brought a new shower pump and the old one was using 15mm inlet
and outlets, but the new one has 22mm inlet and outlets.

The original Surrey flange has an 18mm outlet, is that correct??

But the new one I got with the new pump is 22mm, so how do I take the old one off the top of the tank and replace it with the new one.
Do I need to get inside the tank or would it just screw into the existing flange.

I brought a Salamander S Flange to go with the Salamander RSP75 pump.

 

[seco services]

just unsrew it from the cylinder

 

[markdraper]

here is a picture of the flange, do I just unscrew the bottom bit on it and then screw that into the tank. not using the bottom nut.

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[seco services]

yes if your cylinder has a female thread just remove the bottom nut.