Authentic Groz Professional 4 Jaw Coupler for Grease Hose Model: HC/14/4/N (with Hex Nut), HC/12/4/N (Heavy Duty) & HC/11/4/N ( Standard Type) Thread: 1/8″ NPT Best selling coupler for professional use Hardened coupler body withstands high pressure without deformation Fully hardened spring steel jaws