Cash Acme 21714-0150 The nclx Series relief valves feature a Cast Bronze body, Brass and stainless Steel internal parts, silicone seat disc, and stainless Steel pressure spring Cash acme nclx valves are automatic and reseat after temperature or pressure relief Valves with extended inlets: nclx-a = 3-1/3 inch shank length measured from bottom of outlet Every valve is tested for performance prior to shipping The nclx valve incorporates an innovative "white coat" thermal element coating; an inert covering that provides isolation from mineral deposits and galvanic corrosion, offering years of safety protection