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4" Adjustable Wall Thimble with Termination Made of high temperature rated stainless steel, the WT4-H-8-1 4" diameter wall thimble is easy to install and helps keep your home safe. With adjustable venting, built in termination and a superior design, the WT4-H-8-1 is also versatile, and can span length from 4.1"-7.8". As part of the N-Vent series, this product is UL approved category III venting, and is an integral part of the quick-snap connection system, known for easy installation and forming tight seals. Wall Thimble: Keep your installation up to code, and your home safe with a stainless steel wall thimble that spans the width of your wall (Price subject to change without notice. Check stock before order)