Ham-Let Stainless Steel 316 Let-Lok Compression Fitting, Thermocouple, Adapter, 1/4" NPT Male x Tube OD Adapter fitting to connect two tubes with different end types Male NPT connection on one end and tube connection on the other Stainless steel 316 for higher strength and greater corrosion resistance than stainless steel 304 Maximum operating pressure rating of 10,000 psi at a temperature range of -100 to +1,000 degrees F Meets ASTM A213 and A269 standards for quality assurance