Cap Application Air Gases Hydraulic Oil Natural Gas Non-Potable Water Steam Fitting Connection Type Compression Fitting Material Stainless Steel Fitting Tube Size Outer Diameter 18 mm Material Grade 316 Maximum Operating Temperature 1 500 Degrees F Specific Fitting Shape Cap System of Measurement Metric Compatible Fitting Brands Swagelok Fitting Thread Size 1-20 Standards ASME ATM CPE ISO1550 DNV ISO9001 LLOYDS SAE Color Silver Compatible Tube Material Stainless Steel