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Best 2 fit 22mm pipe won't do any harm , you maybe at a later date decide to fit a larger mains supply.

Why do you need 2 do this ? As stated in last post has it been installed wrong ? ie Cold mains and gravity hot .

Micro bore double entry Vv. If you look inside face of Vv you will see 2 holes one is flow other return , pipe as said fits into hole in Vv before fitting to rad . A common prob with this design is if pipe not fitted or comes loose rad will not heat as water circulates just at Vv body...

you can try and use HEP20 or similar

If you feel comfortable with your chosen height go for it . Their aint no basin police YET.

That's the very one.

The mind boggles.

a bit wee for overflow at 1.5 cm diam !!!!!!!!

If its a new house it MUST be under warranty !!!

Probably a traffic warden in his day job and lives with mummy

Am no a sparky but smell could be coming from an electrical outlet shorting out. Had it on pull cord switches and immersion heater spur. Dont want to be a scaremonger but I would check out sharpish as could be major fire risk.

You must now have the fastest filling cistern in the street now! As my learned friend softus says replace with the high pressure fellow. Cause if by chance your Vv sealing washer/ diaphram goes (and have seen it) your overflow will probablly not cope with water volume, and end up with a...

If you prepare in advance use a pipe freeze kit if you feel confident enough. you can buy them at most DIY stores or merchants . The single use kits aint that dear . Air locks in gravity systems can be overcome by pushing water in by pressurising through mains.

I know you described the property as a flat, but running soil pipe external would look horrendous. Is there no way you can run drainage underground .check the manhole locations and if poss excavate and install along with new stack . will involve local planning building control officer of...

For the sake of say £25 buy new stuff. Save on time and effort. You can always save up you old scrap and sell it on .copper is a great price at the mo providing you have enough ,

Give the pin and Vv a wee rattle to see if it releases , if not alan better off replacing like for like that way you can reuse nut and olive on pipe. No special tools required couple of adjustable spanners and or grips . Put a wee wrap o thread tape round olive if you wish , I use liquid...

Yip :D

Probably not. Best bet would be McAlpine fitting and take it from there.

My theory as well. such a short answer for a long post.

Hep2O will do the trick M8