Bulkhead Double Male Union Tube Weld Fittings- Metal Gasket Face Seal FittingsPart No.UCR SizeDimension (mm)MPanel Hole SizeinchABEFHF-CBDMU-04-1/456.6033.704.7019.0519.059/16-18UNF15F-CBDMU-08-1/265.3037.6010.2226.9826.987/8-14UNF23