Top pipes are 3/4" EMT, bottom left is 1/2" IMC and bottom right is 1/2" EMT. Notice how the IMC fits in snugly, but the EMT is very loose.
Here's how the conduit is "spliced" together. I use a 10" or 12" piece of 1/2" IMC that will go inside the 3/4" EMT. Mark the middle of the IMC piece and insert it into one of the EMT pipes up to the mark. Drill a 1/4" hole through the two pipes a few inches back and insert a 1/4"-20 x 1 1/4" bold through it to hold it. Repeat for the other end of the splice.
The top ridge angle has a hole through it for a purlin connector. Place a 1/4" carriage bolt in a 1/4" drilled hole and tap it down with a hammer a few times and you get a nice squarish hole that will result in a pretty smooth top where the plastic will go. The middle of a 10' EMT pipe is marked before bending it so we know where to drill the hole after the bend.
A finished hoop.
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