Water tank external pipe

What size of pipe is it to change the external water tank draine of pipe and length do i need. Plus jublee clip stainless steel. 
Your help please.

skegguy wrote:What size of pipe is it to change the external water tank draine of pipe and length do i need. Plus jublee clip stainless steel. 
Your help please.

There are two external water tanks - a grey/waste water tank and a fresh water tank.  Which one are your referring to?

If you are changing a pipe, is it currently a rigid or convoluted pipe and what are you changing it to? 

What is the current size and length of pipe?

Beat me to it Caraman.

If the current size and length of pipe is known (or can be easily obtained) the problem would appear to be solved.

Easiest of all would be to take the old pipe to an accessory shop, and ask for another of the same. 

Many thanks, its the main water tank as want to winterise the pipe

Do you need to replace the pipe, or are you just going to lag the existing one?

It would be a great help if you could explain exactly what you want to achieve.

I want to lag the pipework from main wster tank to the tap, but the blue pipe work is too big to lag so want to change it to pipe work so i can lag it.

Just been out to my garage with a bit of Screwfix lagging (about a quid for a metre) and it fits perfect on my old tap. I’m sure the blue pipe is the same size as the grey.

Ok cheers will check

bvwt wrote:Just been out to my garage with a bit of Screwfix lagging (about a quid for a metre) and it fits perfect on my old tap. I’m sure the blue pipe is the same size as the grey.

Even if it doesn't, standard pipe lagging comes in 15mm and 22mm id sizes.

Are you sure it's worth the bother? It won't prevent the pipe from freezing. It will just slow it down - a bit.

If you are using the van you won't want to drain down. If the van is stored for the winter, you will have already drained down at the first sign of sustained freezing weather.

The pipe from the grey waste tank is probably more important. You will want to empty that if you are using the van in severe weather, and the pipework will be the first to freeze - well before the contents of the tank.

I've never bothered in 20 years, and never had a problem - but if you really want to do the definitive job, have a look at low voltage warming wire.  >> SEE HERE <<

I agree with Gromit.  Water is at its most dense at 4 degrees C which is why it freezes from the top rather than the bottom.  For this reason water at the bottom of your tank, which includes water in the drain pipe, may be the last to freeze.  Both my tanks are winterised by having external electrical heating pads on their bottom.  They are not insulated.  Fitting insulation to the drain pipe will do no harm but may not achieve that much.  I wouldn't narrow the bore of the pipe by fitting pre-insulated pipe if such pipe exists.

If this is the blue drain pipe for the fresh water tank auto sleepers use a 1" pipe.  suppliers seem to stock an ethic equivalent but in my experience this does not fit.  Autosleepers will supply the correct pipe and it is not particularly expensive but the postage is comparatively high.

Hi
Just replaced mine with the 23.5mm convoluted pipe and you also need to use a suitable sealing sleeve to push fit onto the tank spigot
Both on eBay, see links below

The convoluted pipe is easy to cut to length with a knife

I also fitted a stainless steel jubilee clip for good measure but the sealing sleeve works fine without

https://www.ebay.co.uk/itm/5m-Waste-Water-Pipe-23-5mm-ID-Convoluted-Hose-5-Metre-Caravan-Motorhome/322444694506?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2648 

https://www.ebay.co.uk/itm/2-x-Waste-Water-Pipe-Hose-Sealing-Sleeve-End-23-5mm-Caravan-Motorhome/323859938273?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2648