"Set Square" wrote in message
...
In an earlier contribution to this discussion,
Frank big@hole wrote:

Can a bathroom sink have an S Bend as apposed to a waste trap?

Apart from preventing smells coming up the pipe, is the traps main
function to collect anything that gets dropped down the sink and if
so then why does a bath not have this?

Cheers

Frank.

They both do the same job - provide a plug of water which prevents nasty
smells coming up to the sink/bath/basin/whatever from the sewer. A trap is
more compact, and takes up less horizontal space, in particular. Otherwise
it doesn't matter which you use. A lot of baths *do* have traps.

Modern plastic S-bends are often not very deep (their lead pre-decessors
had
used to be a lot deeper). P-traps come in various depths. You sometimes
need
a deep one if the waste pipe isn't adequately ventillated such that the
pressure can drop and suck the water out of the trap. Deeper traps offer
more resistance to this.

Thanks Set Square.