Rattling water pipes fixed

If you have replaced your Whale submersible with a Shurflo and you get pipe rattle in the washroom, it is easy and cheap to fix.
Get two one metre lengths of 15mm foam pipe insulation. (Amazon are still working )
Remove the access panel behind the wash basin in the washroom
Slit the foam pipe insulation along its length - it has a cut-out so you can do it with a finger or thumb
Slide the foam down each pipe - blue and red - for nearly a metre. You might find you get more on if you reach down towards the floor and push the insulation along a bit as you go.
Cut off about 1ft of surplus insulation when you can't push any more on to the pipe.
Refit the inspection panel.
Turn on the tap and stand back and listen to the gentle hum of the pump, and no pipe rattles.

I couldn't help remembering that some (German) motorhome manufacturers insulate their water pipes, as they should be on a decent quality built machine. I notice these things when I go round the NEC poking my nose behind panels and in cupboards.

My next revelation here will be 'how to refit your kitchen sink drain so it runs downhill'. Apparently A/S is unaware of the fact that water runs downhill. They are not alone: Rapido also don't know this secret.

As long as the Whale is working well I think I will 'sensibly ' leave well alone but agree with your insulation sentiments  Have done this on several Van's especially the hot side.

It has been mandatory for a few years now to insulate all hot pipes in new build houses. I thought it was silly at first until I did mine in my 50 year old house. What a difference! You can run hot water, go away for two hours, run the hot water again and within two seconds hot water comes out of the tap. It's well worth doing in a house but I can't imagine it makes much difference in a motorhome.
As for sensibly or otherwise replacing the Whale submersible, well I am just biased against them having had several pack up on me when they are reasonably not-very-old, if you get my drift. Like computerised cars and motorhomes they are fine when they work, but annoying when they don't. ShurFlo pumps can be reckoned to last ten years, then all you do is buy a renovation kit and rebuild them. My experience of Whale submersibles ranges from two weeks to two months use before they pack up and go in the bin. I have heard that other people are happy with them, so fair enough, keep using it.

Edit: I don't want to annoy anyone so I have removed the word 'sensibly' from my original post. These are not times when we should be annoying one another. 

No problem GG!   Agree first thing I did when we bought this house all those years ago was replumb and Insulate every pipe including the central heating flow and return.....my back has never been the same since, crawling around under floors!

Caraman wrote:Thanks gassygassy.  That's given me a little job to do during this period of confinement.  The pipe noise in the bathroom hasn't bothered us but it will be nice if the Shurflo can be made to run more quietly in that area.  I reckon it is quieter than the whiny Whale outside the bathroom.

Well that will occupy you in between morning elevenses and lunch time. What are you doing this afternoon?
15 minutes is all it takes.

I suppose the bangyness of the pipework is dependent on where the pipes happened to position themselves in the cavity.

I think I will amuse myself by sending it off to MMM. See if I win a bottle of car wash shampoo.
Won't all our motorhomes be all shiny and polished when the Great Rush to use them comes about at the end of it all?

I think my next job is to remove the cooker (I have an EB) and refit the kitchen sink drain so it runs downhill. Then I might find the water pipes leading to the kitchen tap and lag them as well.