You will want to go with T-Bolt clamps, they are the best. You want to get a size just slightly bigger than your pipe size so the clmaps will fit over the coupling. If you can find a NAPA warehouse the usually have them for the big trucks but they will work. The clamps cost for $2-$6 depending on the size of clamp you need.
For t-bolt, the best place to buy is Merles. I only used one and needed only one on my Single car; the compressor outlet.
The rest of my car (even at 722RWHP) uses only quality worm clamps. Why? Well, you install and torque them only once. If they ever need to come off you simply throw them away and replace them with new ones. I found out by a LOT of trial and error that this is the best way
If they become twisted at all, throw them away.