This LET-LOK fitting both seals and grips the tubing for a leak-tight assembly. - The 316 stainless steel construction helps resist corrosion. - Suitable for food processing, petrochemical, and pharmaceutical applications. Tube Fitting Material / 316 Stainless Steel Fitting Connection Type / Compression x FNPT Pipe Size - Pipe Fitting / 1/4 in Tube Size / 3/8 in Compression Thread Size / 9/16-20 Max. Pressure / 3350 to 6550 psi Hex Size / 3/4 in Temp. Range / -425 Degrees to 1200 Degrees F Standards / ASME, ASTMA, CE, MIL-F-18866, SAE Compliance / GOST, ISO 9001, RoHS