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Curve fitting is the process of constructing a curve, or mathematical function, that has the best fit to a series of data points, possibly subject to constraints. Curve fitting can involve either interpolation, where an exact fit to the data is required, or smoothing, in which a "smooth" function is constructed that approximately fits the data. A related topic is regression analysis, which focuses more on questions of statistical inference such as how much uncertainty is present in a curve that is fit to data observed with random errors. Fitted curves can be used as an aid for data visualization, to infer values of a function where no data are available, and to summarize the relationships among two or more variables. Extrapolation refers to the use of a fitted curve beyond the range of the observed data, and is subject to a degree of uncertainty since it may reflect the method used to construct the curve as much as it reflects the observed data.

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  1. B

    Garden Tap fitting- thread size.

    Hello. I've attached an image of an old garden tap with a new garden tap replacement, except the thread on the new tap is larger than the existing tap fitting. Is there a reducing nut that can adapt the new tap to the wall fitting or could the new tap handle be used to replace the old handle and...
  2. S

    Waste to trap loose fitting

    just put a new pop up waste into my basin to find the trap does not fit correctly.. the trap fits just inside the waste thread opening and butts up against the plastic shoulder ensuring the rubber seal is pressed against the end Face of the waste. im able to screw the nut up but even when its...
  3. G

    Identification of UFH Pipe Fitting

    Morning, Doing some work on our UFH manifiolds and was wondering if anyone would be kind enough to let me know what the T-fittings in the picture are, thought they might be some kind of tektite fittings? Many thanks.
  4. B

    Fitting a pocket door.

    Have an en-suite to create from scratch, customer would like a pocket door into the room. Can anyone recommend a kit they have used, studwork will be 38 x 89 cls with 12.5” plasterboard and skim coat (~120mm total). I will be doing all the work but have never fitted one before. There seems to...
  5. H

    Which fitting for trite on shower replacement?

    Hi there, First time changing a shower or any sort of plumbing work really. Previously had an old Gainsborough shower unit which packed up yesterday, so I’ve bought a tritron easi fit today with the hope that it would require minimal effort haha. Only issue I have is the water pipe on my...
  6. C

    Fitting non return valve

    The discharge hose from our washing machine comes out of the machine, runs about five feet along the floor under the work surface and then goes vertically up under the sink where it joins the sink discharge pipe. Every time we empty the sink, the water often goes back down the hose and even...
  7. J

    Shower fitting advice

    I have an existing shower which I've removed and exposed the two pipes from the wall. If I was taking a guess they're around 2cm ish in diameter. I have the Mira shower here is the instruction guide...
  8. L

    Fitting a Macerator behind a CC Toilet

    Hi Guys I am at the design stage of having a En-Suite built and have an issue that I cannot seem to resolve. For long and complex reasons I have to have a macerator and that needs to sit behind a close coupled toilet. this will take the waste from a sink, shower and toilet. Saniflow say I need...
  9. L

    Fitting a macerator behind a CC toilet

    Grudfos do a unit called Sololift WC3 that has a recessed front that suggests it might fit behind better but as I cannot get to speak to anyone at Grundfos other than an automated messaging system, I cannot confirm this. So my question is, have any plumbers on the forum had issues fitting...
  10. G

    Identify Unknown Pipe Fitting

    Hi, Hoping that someone could please identify what this leaking fitting is, such that I can explain it to a plumber. Not sure whether the groove on the top is a location where you can tighten these "fittings", or whether that is best left to a professional to deal with. Many thanks for any help.
  11. T

    New sink flexible hose nut leak at fitting.

    Hello , Should i tighten more or should i buy pulmber tape or its not that bad to leave like this permenantly? Thanks.
  12. S

    Issue fitting replacement door & frame

    I have a Neo-Angle shower tray, … imagine an oblong with corner cut at 45 degree It’s 1.2m x 0.9m The ‘Roman’ shower door has failed, the only shower door that fits this tray is a now a ‘Roman’ glass frameless style. Ordered it and I have hit a problem Installation is by fixing the vertical...
  13. M

    how to cure drip from fitting

    I have a towel radiator that has a tiny leak on the lock shield side at a right angled compression fitting. There is a drip every 10 seconds from the back of the compression nut. The fitting is so small that I can't get the compression nut back to wind ptfe round the olive. I've tried ptfe round...
  14. B

    Fitting a cistern (with frame) into a stud wall (100mm) (follow-up)

    Hello all, This is a follow-up to this post: Fit wall-hung toilet to inside stud wall? - https://www.plumbersforums.net/threads/fit-wall-hung-toilet-to-inside-stud-wall.127877/. I'd like to fit a cistern into a stud wall, which is 100mm wide. Typically, the dimensions of the toilet fixing...
  15. J

    Shower tray installation: Easiest method of fitting

    Hi guys Just looking for advice on how to make the installation of a 1200x800 stone resin tray easier. I'm fitting a tray into a space with three walls, so obviously space is minimum. The last time I did this I rigged up a pulley from the ceiling joists to raise and lower the tray into position...
  16. C

    Corner valves for a radiator

    Hi, I have bought corner valves to use on a new towel radiator. As you can see in the attached pic, one part of the valve has a small circular hole in it, and the other part has a large semicircular hole. Which end - 1 or 2 - should I connect to the water pipe and which end should I connect to...
  17. Daaave

    Fitting zone valve query

    Hi all, I have a 28mm zone valve for a C Plan I want to fit and would appreciate some advice please. I’m looking for the best way to adjust the existing pipework - my idea is to fit the valve at the green circle, tee off beneath it for the vent pipe and cap off the reducer at the cylinder...
  18. T

    Advice on fitting Nest or Hive Controllers.

    I currently have normal programme controls with thermostat for 3 zones (3 floors). The main controls are located together on the ground floor and individual thermostat controls on the 2 other floors. Would either a Nest system or Hive be adaptable, if so any advice on which would be best & how...
  19. M

    Pipe fitting welding courses

    Would a welding course help a plumber cross over to pipefitting?
  20. A

    Flexi hose leaking at fitting.

    Hi, the fitting on my flexi hose that goesto my cistern is leaking slightly. Has anyone got any advice? Thanks Andrew.
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