Clamps for holding poles together--set of 8 - $25 (Gunbarrel)

Set of 8 clamping brackets for attaching poles together.
These were made to clamp the upright poles of an enclosure net to the legs of a trampoline, but they'll work on any pipe or tubing about 1 1/2" in diameter.
Made of galvanized steel with rubber padding.
This design includes jam nuts to keep the bolts from working loose once you snug them down.
--This kind of parallel tubing bracket would work for attaching seasonal hops poles to base stakes or posts.
One side of the bracket is sized for the average trampoline leg diameter but the other side is tapered so it would attach to slightly thinner tubing also, be it conduit, plastic pipe, etc.