3-In. Super Chlorinating Tablets, 25-Lbs. Brand_Cooper Wiring Spyder’s TCT hole saw is

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3/4" hole & hitch pin

3-In. Super Chlorinating Tablets, 25-Lbs. Brand_Cooper Wiring Spyder’s TCT hole saw is"The HTH(TM) super 3"" chlorinating tablets, 25 lbs., are an effective swimming pool water sanitizer. These convenient and easy to use tablets are formulated to protect against chlorine loss in direct sunlight, and can be used in feeders. They are designed to dissolve slowly to provide a steady source of available chlorine."