In article ,
Dean Hoffman wrote:

On 5/1/17 7:02 PM, DerbyDad03 wrote:
On Monday, May 1, 2017 at 7:46:56 PM UTC-4, Dean Hoffman wrote:
On 5/1/17 6:12 PM, ItsJoanNotJoann wrote:
On Monday, May 1, 2017 at 6:10:30 PM UTC-5, ItsJoanNotJoann wrote:

Corrected link, sorry.

https://www.amazon.com/GE-54947-Grou...006IBFA/ref=sr
_1_11?ie=UTF8&qid=1493680286&sr=8-11&keywords=wall+tap

It isn't really GFCI. It won't trip if there is an inbalance
between the hot and neutral wires. Grounded, yes. Or, maybe I'm
missing something obvious in the description.

What you're missing is the intent of her question.
She wants a 6-receptacle tap that will screw-mount to a GFCI receptacle.

The device she linked to will screw mount to a standard duplex via the
center screw. (You remove the existing receptacle plate and replace it
with the tap.) She is looking for something similar that screw mounts to
a GFCI, but of course, we all know that a GFCI doesn't have a center screw.
A GCFI also has those pesky Test and Reset buttons.
Suppose she put one GFCI upstream of this outlet wired in series.

My garage has one GFCI outlet. It feeds several other plain outlets,
one of which is outdoors weatherproof. I think this is the way many
GFCI outlets were designed to be used. My one concern is that the
circuit might be overloaded with so many outlets from one breaker. (I
also have some 6-outlet adapters.)

Soon after the garage was rewired that way, I discovered the value of
GFCI. For an instant it has a slight tingle!

Fred