Ham-Let 3002012 Stainless Steel 316 Let-Lok Compression Fitting, Adapter, 1/2" NPT Male x Tube OD Adapter fitting to connect two tubes with different end types Male NPT threads on one end and a tube connection on the other Stainless steel 316 for higher strength and greater corrosion resistance than stainless steel 304 Maximum operating pressure rating of 11,000 psi at a temperature range of -100 to +1,000 degrees F Meets ASTM A213 and A269 standards for quality assurance