Cash Acme 23577-0150 NCLX-LX Temperature & Pressure Relief Valve, Lead Free, 3/4". The NCLX T&P Relief Valve incorporates an inert thermal element coating that provides effective isolation from mineral deposits (liming) and galvanic corrosion. The NCLX features include a cast bronze body, brass and stainless steel internal parts, silicone seat disc and stainless steel spring. The NCLX comes standard with a test lever. The valve is completely automatic and reseats after either temperature or pressure relief. Cash Acme NCLX Combination Temperature and Pressure Relief Valves are designed for the protection of water heaters and storage tanks and are ideal for all domestic water heater applications.