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Yes, I think that is it. Thanks for the info. The grey plastic pipe mystery still remains.

I have a suspicion that angle grinder for the copper pipe fittings would be overkill? Maybe I just need some larger heavy duty spanner or the Stilson pipe wrench? I have ordered big Bahco spaners and pipe wrench from Amazon, and they are on my way.

Yes, that is still mystery to me. I will try to dig into the fibre glass insulation pile where the plastic pipe has dug into. Yes, the copper pipe floating at the corner seems the vent pipe from the Hot Water Boiler from downstairs kitchen. Not sure what it does either. OK it vents, but why...

I read that 90 degree elbow would decrease the flow of water. Would it have been another reason for adopting the raised end pipe with a cap?

So it could be replaced with a 90 degree elbow, or straight bent pipe then?

Close-up of the raised end of the mains rising pipe. It is capped.

Close-up photo of the plastic pipe TEE.

It is capped. I was wondering why it is raised up too.

Thanks for your instruction on replacing the rubber washer in the old float valve. I have been monitoring the old float valve after the arm bending adjustment, and it seems working fine keeping safe water level and not over flowing anymore. So I will keep monitoring it for a while until it...

Cannot trace where the plastic pipe is going to or connected to. It goes into the floor of the loft and buried into the glass firbe insulation piles. Downstairs in the kitchen where the mains water is coming in and the immersion heater boiler is are all the copper pipes. The only clue I have...

From the float valve.

When both the full bore valve and gate valve are totally shut, water still fills into the tank. It must be from the grey plastic pipe I presumed. When downstairs immersion heater boiler was totally drained, the filling-in to the cold water tank totally stopped. Initially I thought the old...

That is the old cold water tank in the loft I have been working on few days. The mains rise pipe is visible with the newly installed ball valve, and the old gate valve on the pipe. But there is a grey plastic pipe also connected to the pipe with a plastic TEE. I thought that grey plastic pipe...

Will look into these, and plan for the 2nd attempt in due course. Thanks for great info and advice.

I had to leave the old float valve as is, because it is solidly stuck on the fitting hard, both from inward and at the back it wouldn't even try to come off or move slightest. I just left it due to possible breakage on the tank, if I forced more. And the other problem was that I didn't have...

Great idea too. I will try that way first, and if it didn't work then take the elbow off. Thank you Alec.

Great info and and advice. I have already bought a new replacement float valve Type2. I was under presumption that all these valves would be same fitting design. But obviously they are not. I will take the whole valve off the tank, and replace with the new Type2 float valve. Thanks.

I see. Not a good design of the valve for replacement I feel. :( Thanks Rab.

OK thanks.

Can the valve be taken out from inside the tank? Does it not connect to the fitting by thread? Is the whole valve including the fitting one piece? Or just undo 4 from 5 leaving 1 2 3?