Prepositions and postpositions, together called adpositions (or broadly, in English, simply prepositions), are a class of words used to express spatial or temporal relations (in, under, towards, before) or mark various semantic roles (of, for).A preposition or postposition typically combines with a noun phrase, this being called its complement, or sometimes object. A preposition comes before its complement; a postposition comes after its complement. English generally has prepositions rather than postpositions – words such as in, under and of precede their objects, such as in England, under the table, of Jane – although there are a few exceptions including "ago" and "notwithstanding", as in "three days ago" and "financial limitations notwithstanding". Some languages that use a different word order have postpositions instead, or have both types. The phrase formed by a preposition or postposition together with its complement is called a prepositional phrase (or postpositional phrase, adpositional phrase, etc.) – such phrases usually play an adverbial role in a sentence.
A less common type of adposition is the circumposition, which consists of two parts that appear on each side of the complement. Other terms sometimes used for particular types of adposition include ambiposition, inposition and interposition. Some linguists use the word preposition in place of adposition regardless of the applicable word order.

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  1. R

    Grant Bottom Baffle burnt through

    Hi Oil experts. I had a grant wall boiler with a failed transformer. Carried out a service and pretty sooty nozzle, and baffles build up suggest not cleaned in a while. The bottom baffle on the left corner had completely burnet through. Any Idea on the process on how this occurs and why just...
  2. Z

    Heatloss through internal ceiling

    Hello, i'm doing some heatloss calculations, going by a fairly old plumbing book. The formula for calculating heatloss would be Surface Area x Temp Diff x U-Value = Heatloss My question is, when calculating the heatloss through a ceiling, so downstairs to upstairs, the temp difference would be...
  3. S

    Hot pulling air through open vent.

    Hi, I'm new to the forum and just some background on myself. I have 4 years experience as a plumber but haven't worked in the trade in 15 years. I would say my overall knowledge is not great as I did most of the 4 years working on rinse and repeat estates of houses. I was also quite young and...
  4. P

    alternate straight through CH return valve for combi

    I'm in a bit of a bind with a current CH install where I need to install a filter prior to a flush but no where to install My issue is the return on the combi (ideal 35) runs directly behind the boiler then up through the ceiling so I have no clearance to even attempt to snake it out to fit a...
  5. M

    Condensate external or drill through from garage

    I'm on a new build the boiler is in the garage. I have the option of drilling straight out with the condensate in to the stack. Or drilling through from the garage to the house to tee in to the kitchen sink waste. So it's either coring out and coming out with that black dot is.
  6. Chris2023

    Will water run through a switched off boiler.

    Long story short I have a leak from possibly the flexi hose that connects to the upstairs hot water tap. I've switched off the boiler and mains water and waiting on a plumber but not sure when they'll arrive. My question is if I leave the boiler off and then turn the water back on so I can use...
  7. T

    Why is water flowing through my expansion pipe

    Water is flowing through my central heating expansion pipe even when cold with the pump running. Hot water flows through it when the system is heated. Pump has been replaced but still happens
  8. C

    no flow through boiler

    two storey house with vented system and baxi boiler. Have had the BAXI engineers to fix a slight leak on boiler but when they tried to fill the boiler there was no flow . They think that the cold water feed is perhaps blocked with sludge although this enters the 22mm return flow just after the...
  9. D

    Thermostatic radiator valve lets water through at 0

    Hi everyone. Apologies - I'm new, but I promise to try and be an active member of the forum :) We're doing some decorating just now and it was suggested that we take off the radiators to make it easier for the plasterer. We decided to have a go ourselves rather than getting someone in for...
  10. N

    Advice on flue through fake window

    Good afternoon, I was hoping someone could advise regarding the regulations around flue terminations through a 'fake' window. We have a mixed-use development with a ground floor commercial unit and residential above. To keep with the style, a 'fake' window has been installed to the rear of the...
  11. D

    Pipes that run through bedroom and need rerouted

    Hi folks. I have 2 pipes that run through my bedroom that are boxed in by skirtings. Both these pipes come from the boiler that sits in a cupboard in the kids bedroom and run roughly about 20 feet around the room and then go through the wall to the bathroom. Both are copper pipes. I have been...
  12. A

    What amount of water pressure comes through a normal house ?

    Every time I use a stop end when I turn the water back on I think to my self that’s going to pop off and flood the house. What amount of pressure can they with stand ?
  13. 2

    Rad not heating up. Warm water through both valves.

    I have a house with 15 rads in it. In a bedroom upstairs I have a rad that isn't heating up. This rad was moved about 5 years ago with 1/2inch plastic pipe to new location in the same room but was never turned on. Tonight I tried to blead it but then removed the rad, emptied it and when off...
  14. R

    Help... no gas coming through meter or regulator

    My daughter has just moved into her first rental house with gas stove and hot water in Melbourne. The meter (pictured) definitely has gas connected to the regulator. But gas is not getting to the stove or water heater. The previous tenant had turned the gas tap off at the meter but it's on now...
  15. E

    Anybody drilled through a floor with UFH before?

    Looking to install a kitchen island with integral sink, this will mean installing drainage and plumbing. But will need to dig a hole through UFH, has anybody done this before?
  16. O

    Central heating pressure is discharging through condensate trap.

    Hi everyone, my sister's 5 year old Worcester Greenstar CDi Classic boiler is losing pressure rapidly[down from 1.5bar to zero overnight]. I checked everything I can think of including all visible pipework, radiators and pressure relief valve outlet and couldn't find a thing out of the ordinary...
  17. P

    Chasing radiator pipes through joist and wall

    Hi all, hoping there are answers out there to my small dilemma. A customer of mine wants 15mm radiator flow and return pipes chased into the block wall and pop out down the bottom. Problem is the joists are close to the wall so to start the chase in the block i will have to notch out the joist...
  18. F

    Shower Waste through concrete floors - any advice ?

    Hi everyone, First a quick bit of background : I'm English, living in France, and renovating a 1960s house, which has pretty much needed to be stripped back to the studs, and started again. Full new electrical refit, plumbing refit, walls, ceilings &etc. It took about a year-and-a-half (as...
  19. Bogart

    Flow rates through 2 and 3 port valves.

    Yes it me again with another question. I keep reading that one will get a better flow rate in an S plan than in a Y plan. Now I can see that being valid if both heating and hot water are called for but if only one surely the flow rate will be the same for both plans? Finally are there any makes...
  20. eli-nathan

    Saniflo motor runs through the night

    Recently moved in to a flat and we have a Saniflo toilet in the ensuite. For a while it was okay but then it started running occasionally without being used. It has started running every hour or so through the night and it makes a huge noise so we just switched it off. After turning it off...
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