I've now got 3 hot water bottles from CVS. They
last a few weeks and then start leaking. I cut open
the tops and discovered that it uses a clear plastic
threaded insert. The bag is some kind of vinyl/plastic.
The insert looks like acrylic. It has large threads on
the outside to screw into the bag opening and
large threading on the inside to accomodate the
plastic plug threads. The leaking happens between
the insert and the bag.
Now I'm wondering what I might seal that with.
My thought is to back out the insert, which seems
to seal merely by its snugness, and add some kind
of sealant, then screw it back in.
Polyurethane construction adhesive? Thick epoxy
glue? It needs to be something flexible that will stick
well to both parts and resist heat and water. My first
thought was a gasket sealant I used to use on bad
drain connections. It was reddish black, gooey and
dried hard. But I can't seem to find that product
anymore. Any caulking I can think of wouldn't hold up.
Cyanoacrylate *might* stick but wouldn't fill gaps....
| > Now I'm wondering what I might seal that with.
| Why would you bother?
Because I have 3 perfectly good hot water bottles, if
I can just seal the tops. They should all last until they
get accidentally punctured.
| Since they are defective you should return them
| for a refund and inform CVS the whole lot of them is probably defective...
| then get a different brand
They all worked for awhile before they started to
leak, so none of them is new and I have no receipts.
I don't save receipts for $10 items, anyway. And CVS
has one brand. Do you suppose Walgreens has a
much better brand? I don't see any reason to think
that. I'm guessing it's a case of planned obsolescence.
So I can go out and test different brands, assuming
I can find different brands, or if I find the right sealant
I can have 3 new hot water bottles and the knowledge
of how to fix the next one that leaks.
In your original post you said they were just a few weeks old.
Even if you do not have a receipt I think that CVS is a reliable enough
store that they would want to know that they were selling a clearly
You will be doing yourself, CVS and many other customers a big favor by
reporting this defective product.
If Walgreens sells the same brand though, no, I would not go there and
buy one ...but chances are they have a different brand.
The OP is not going to do that.
He is going to fix that $10 bottle even if it costs him $20 to do so.
A good engineer at this point would ask why he needs the hot water
bottle and if he's got a muscle ache (for example) to address /that/
problem so he does not need the water bottle in the first place.
All kidding aside though, I /do/ understand why he wants to just fix it
rather than take it back for a refund. I fix a ton of things that 99%
Silicone rubber stays flexible. But why not go to Walgreens and see if their bottles have the same construction, you ought to be able to tell by looking at the stopper area if it will have the same problem.
| Even if you do not have a receipt I think that CVS is a reliable enough
| store that they would want to know that they were selling a clearly
| defective product.
How about this: I'll give you one, then you can
return it for the $10 refund. I imagine that will make
your day. You'll make 10 bucks and you can stop
I'm sure half of America would love to advise me on
how to be a smart and demanding consumer. But my
question is about sealant options for rubber/plastic.
| > My guess is that this stuff from Pep Boys will work. I use it as an
| > engine oil pan sealant and gasket maker, which is a high temp
| > location. It is also the same stuff that Hyundai dealers use.
| Oops, I forgot to add what "this stuff" is:
That's a thought. I hadn't thought of automotive
products. But it needs to stick really well to both
surfaces, too. Gasket goo ends up under pressure.
It doesn't need to actually stick.
| If you don't need glue to fasten the inserts, plumbers' grease should
| seal them. Hot water isn't supposed to melt it, and it won't react with
| the materials in valves.
You mean the paste sealant ued instead of
teflon tape? That might work. The stuff I had
in mind is a version of that that hardens.
It's hard to guess exactly what will work best.
The fitting is "screwed into" the plastic
bottle mouth with giant threads. There seems
to be no sealant of any kind now, but one would
think that the pressure would be enough to seal it.
I'm speculating that the insert was designed for
a more rubbery bottle that would mold itself
around the threads, though I don't really know.
It's grease, intended to protect and lubricate valves. It's useful from
-40 to 400 F, isn't toxic, and doesn't affect things like O rings. When
I overhauled a pump-up sprayer, I used plumber's grease to be sure
connections wouldn't leak water or air.
| 1. Acetone. Dip the threaded insert in acetone and immediately insert
| while rotating. Basically, you are fixing a leaky water bed.
Does acetone dissolve plastic? I've never known
of any usage other than removing nail polish or
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