wrote in message oups.com...
"This cap works great but it's missing. How
can I prevent hair from going in there and where can I buy a
dome drain cap? "

Since the drain cap appears to have been sufficient in the past, why
not just replace it? Plumbing supply or perhaps one of the big box
stores.

I'd search for the cap at ACE and big box stores but only find this.

http://www.dollardays.com/images/f42/image2/543.jpg

The kind that works has a dome shape made of stainless steel
and hard to find.