This is what I used at the top:
This is what I used at the end of each pipe. I was able to drive my Playa Staples throught the T:
Here is a picture of the Playa Staples:
I used one set of Playa Staples for the tent itself and one more for each of the PVC pipes. Eight of those babies and that tent does not move.
The Playa Staples can be found at http://ironmonkeys.org/Store/Playa+Staples/default.aspx
The larger tent was a Coleman. I'm not sure what the smaller one was. My wife sewed the rain flaps over the netting on the tents to prevent the dust from coming in. Needless to say these tents are strictly for Burning Man.
Don't believe everything you think.