Wrench for a water purifier (Reverse Osmosis filter) resin tank cap

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If You Have A Fish Tank, And Especially A Salt Water Recifal Fish Tank, May Be You Have A Reverse Osmosis Filter To Purify The Tap Water You Use For Your Tank. Now I Don'T Know About You, But The Device I Got Came With A Wrench To Unscrew The Fiber Filter Tanks, But None To Open The Resin Tank (The Last Tank In The Water Circuit). And It Can Be Really Difficult To Open ! That'S Why I Designed This Wrench, And I'M Now Able To Replace The Resin Without Ripping The Skin Of My Hand Appart ! Enjoy

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