Aluminium Alloy Weld On Filler Neck And Cap 2 1/2" I.D. Automotive / Aerospace-quality Aluminium Weld On Filler neck and cap. Type: Weld on Cap and Neck. Weld on Fitting, 2 1/2" I.D, Aluminum, Each. Neck thread is 3"x12 TPI UNF Cap thread is 3"x12 TPI UNF.
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