Minecraft Interactive Experience
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A wither choker is a machine that is designed to kill withers by suffocating them in a bedrock trap mainly using the bedrock fountain in the End or the Nether roof in the Nether.
End fountain designs
JC Playz's design (Bedrock Edition 1.16+)
Nether roof designs
JC Playz's design (Bedrock Edition 1.17+)
This farm uses a glitch that allows you to form the right shape with the bedrock by using powder snow. This glitch could be patched so you might want to use it while you can.