Size and thread type: -06 (3/8") NPT Female Rigid for -06 (3/8") Hydraulic Hose
Dash and Tube Size: -06 and 3/8" Industry Nominal Thread Size: 3/8-18" Actual Measurement of Male Thread OD: 11/16" or 0.68" Actual Measurement of Female Thread ID: 5/8" or 0.63"