Image Image Acetylene Coupling Left Hand Thread x Hose Shank Jump to Section Product Options Related Products Product Options Part Number Female Thread Size Hose ID Female Thread Material 1540306K 3/8"-24 3/16" UNF Brass 1540309K 9/16"-18 3/16" UNF Brass 1540409K 9/16"-18 1/4" UNF Brass 1540509K 9/16"-18 5/16" UNF Brass 1540609K 9/16"-18 3/8" UNF Brass Related Products Image Oxy-Acetylene Adapter Left Hand Thread x NPTF