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Very much fronded upon to use oxblood today, except in certain Mithraic initiation rituals. Edit - i'm wrong here ; the followers of Mithras slaughtered bulls for sacrifice, not oxen. Replacing the ballvalve is probably the simplest and best solution.

Of course not, nor should the flue wobble. Your man's a t**t. Get someone else in to redo the job properly and, for your own sanity, have no further dealings with the original installer. Going after the original installer for the costs of this -and remember your daughter was not the original...

Loctite 55 cord would be better than PTFE tape. Videos online for how much -its more of a "feel" thing, you want to feel some resistance on the last turn(s). Could use hemp and jointing compound- some people disapprove but the continentals still use, indeed the threads are pre-roughened to help...

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YES If you then turn on another cold tap fully e.g. a garden tap your gauge will then read the dynamic pressure.

Yes III

According to Floplast ' "There is no maximum gradient; a fall of 1:10 is usually considered as a maximum guideline. BS8301 states “Research has shown that high velocities of sewage flow arising from steep gradients do not cause increase erosion of pipes or deposition of solids.” '...

Increased radiator sizes may require larger pipework. Survey and calculation required.

3-part plastic high-level flush pipes are still made for retrofit, cut and trim as required e.g. https://www.cityplumbing.co.uk/p/wirquin-macdee-high-level-flush-pipe-3-piece-white-side-wall-dfp12wh/p/931543?srsltid=AfmBOorr2PvEmTzkYzUJsPmyP1sjq3r6iFdlqhySgI9-n-YswhgHJY-f

First impressions very likely correct...

21mm approx OD black alkathene will be 1/2" imperial nominal internal bore . Roughly equivalent to15mm copper and 20mm OD modern blue poly.

The twyford classic pan is available in both horizontal outlet and S-trap versions. Can be used with both high and low level cisterns.

£600 to not fix the problem?? Ahem.. Clean and degrease mating surfaces and apply CT1 or similar to glue the speedfit elbow into the soil pipe. Secure with cable ties, daisy-chained to achieve length. Allow, if possible, overnight to set. Won't make the unvented install correct but should...

This is almost certainly a generic euro unvented product imported without UK type approval/certification. Cheap for a reason. With the correct safety inlet group and appropriate expansion vessel (and safety discharge pipework) hard-piped in it probably could be made to work safely, if...

or https://www.screwfix.com/p/rothenberger-monoblock-tap-spanner-set-3-pieces/40102

http://www.klar-environment.com/pdf/PD0094-24BA-BB_Installation_Guidelines.pdf page 10 might be of use Disclaimer: I'd talking to klargester technical help before taking this on (or employing a pro)

Check expansion vessel pre-charge and check for water stains below the discharge end of the pressure relief pipe.

Shotgun! Yeah, neighbours, legality, blah..

We talking the boiler flue on the pitched roof or the terminal on the masonry chimmney? It would take a stork's nest worth of twigs to adversely affect safe operation of the former.

if you have cisterns in your loft i'd check the ballvalves shut off fully