The Knockout is the unofficial "Swiss Army Knife" of pipes. Not only can you do Knockouts, but you can turn any bottle into a water pipe.
1. Grab an empty bottle.
2. Fill it half way with water.
2. Take off your one-way Duckbill valve.
3. Pack your herb in the one-hitter.
4. Pop the Knockout on a bottle.
5. Toke away.
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