Looking to make a 4" ring and I don't have a bender. I'm sure I could buy one someplace but I really don't want to wait on the shipping or I won't have my welder with me on the way to the river
Got to the hardware store and buy some 3/8 steel rod.
You will need an anvil with a pointy end or something similar then start hammering
If you make it red first its easier
Or go to a plumbing shop and buy a 4" schedule 80 nipple and then have them cut as small of a ring as they can out of it. Most cutters can get it down to less than ½" and it works fine. Could go 3½ but it's not needed if you have good pressure. Here's the specs on pipe size. Also you can cut and bend it smaller if you feel the need but... Steel Pipes Dimensions - ANSI Schedule 80
Then you could also go to a muffler shop and have them press it with their hydraulic pipe coupler that will just make your nozzle tip smaller and then cut off the excess.