Adding a shutoff valve without turning off water - GIF

Adding a shutoff valve without turning off water.

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Previously:

Improvised faucet shutoff float valve - GIF
Ball valve animation - GIF
Loosening a water valve - GIF
Patching a broken valve - GIF

If he used the shark bite quarter turn valve instead, would have been a lot faster, just cut the line, push the valve on, done.