Sioux Chief's Shower arm Adapter Wallnut shall be installed at shower riser. Riser shall be 1/2 in nominal Type L Sioux Chief stub out ell that is supported by Sioux Chief Strong-arm Bracket with Wallnut LockBlock tube clamping device. No substitutions otherwise Limited Lifetime Warranty is void. Shower arm Adapter shall be UPC listed. Shower Wallnut System allows stub out connection outside the finished wall eliminating hidden leaks at the riser which promote mold growth. Use with brass Shower arms only. Do not use thread sealant or PTFE tape on Wallnut end of Shower arm.