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The Hart & Cooley 16120 is a four-inch wall thimble designed to provide necessary clearance to combustibles. This thimble is adjustable with a sleeve that extends from three and a half inches to six and a quarter inches.
This wall thimble is essential for safe installation of venting systems.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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