dashes in URLs

Giganews Newsgroups
Subject: dashes in URLs
Posted by:  j (mung_…@att.net)
Date: Wed, 16 Jan 2013

The preferred method of replacing spaces in URLs is with a dash for
SEO. So, a while back, I switched over from underscores.

Now, I have a product that naturally has a "-" in it. Not that I
couldn't see this coming, but I don't make the "rules".

What do I replace a - with? URL encoding is no help because %2D gets
converted back to a - before the software gets a hold of it.

And just why are "-" so great for SEO?