On Wed, 24 Feb 2016 13:48:50 +1100, "Rod Speed"
wrote:

snip

but, if you compress something rubber that's
threaded ... what happens to the thread pitch ... ?

Nothing, because the compression is of the
rubber thread into the metal thread, not in the
other direction where it affects the thread pitch.

And how do you think that compression happens? Chicken and egg my
friend.

Now, it's quite possible that any thread on the rubber
could be designed to match the thread on the waste
when the rubber is compressed to some typical value
but if you have ever tried 'pushing' (rather than screwing)
a thread into place, especially when the other half of the
joint is metal and sharp, the 'threads' may not actually
drop into place (potentially making the seal worse).

Even sillier and more pig ignorant than you usually manage.

Translation. I'm busted and don't have any sensible reply or
explanation.

And doesn't explain why so many found that it
sealed fine without the use of any sealant at all.

And many *also* used sealant that could well have done the job on it's
own.

Nice theory, pity about the real world.

See above.

I wonder how we ever coped?

By using the much cruder approach of a sealant of some form or other.

Quite ... but it worked

Doing it the other way works much better.

I'm not sure there is a better on 'working fine'. ;-)

Corse there is when you don't have to fart around with any
sealant at all, just assemble it and find that it seals fine.

After you have gone out and found someone who stocks the 'Basin mate'
and bought one you mean?

Rod, you know most people have you killfiled and so I'm asking for
trouble by talking to you here. I only do so whilst you remain
reasoned and reasonable. As soon as you stop (and you often do) I stop
talking to you.

Nothing you have said on this matter changes, or will change my
real-world understanding of how things like this work.

One thing I can be 100% sure of. Set up two basins, add the waste to
one conventionally (using sealant) and the other using the 'Basin
mate'. Once the one using sealant has been allowed to cure (if
required), test both using the worst case scenario of the waste
blocked and the sink filled to the brim. I know the one fitted
traditionally will not leak, I wouldn't bet any money that the other
wouldn't (although it may well not).

Would you put £1000 on it?


Cheers, T i m