T-bolt Q.
#3
TECH Junkie
iTrader: (21)
Measure the circumference. (I used a string and a ruler.) Divide by pi (3.1415 will suffice). This will give you the diameter of the clamp you will need. (Should be 4). Keep in mind, if you are planning on putting something on the tb, like a hose or piece of silicone, you should take that into account when you measure for and order the clamp, because the diameter will be slightly larger.