Weld Fittings are used on permanent installations where process piping and equipment can be cleaned in place (CIP) and removal from the system is not required. Weld Fittings are offered in nominal tube sizes 1/2˝ through 8˝ in T304 and T316L materials. Uniform wall thickness for 1/2˝ through 3˝ sizes measure .065 (16 ga). In 4˝ size, wall thickness measures. 083 (14 ga), 6˝ and 8˝ .109 (12 ga).