The Haltech 1/4in stainless steel weld-on kit includes a stainless weld-on base plus nut and ferrule. That combination provides a corrosion-resistant weld-in mounting point together with the compression hardware to terminate 1/4-inch lines, useful where stainless fittings and long-term resistance to the elements are required.
Haltech 1/4in Stainless Steel Weld-On Kit w/Nut & Ferrule