"When you need to bend plastic conduit, because you don't want joints in the middle, or want a bend that's gentler than a bent coupling will give, or the bend needed is not ninety degrees, this is what you need.
Just make sure you attach a strong cord if it's going all the way inside, and overbend than bend back a little to release the spring."
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Review 4 for Tower Bending Spring 20mm Black Pack of 1