Ham-Let Stainless Steel 316 Let-Lok Compression Fitting, Adapter, 3/8" NPT Female x 1/2" Tube OD Adapter for connecting pipes or fittings of different types Fitting connects to pipes or tubing on one end and an NPT female connector on the other Type 316 stainless steel for higher strength and greater corrosion resistance than type 304 stainless steel Operating temperatures range from -100 to 1000 degrees F Meets ASTM standards A213 and A269 for quality assurance