Based on this product's specifications, here are some alternatives and similar models
PRESSOL grease gun tapered coupler M10x1, model 12003
Summary description:
Tapered grease gun coupler by PRESSOL, model 12003, with M10x1 thread. Designed to attach to grease guns for secure connection to fittings and nipples. Suitable for manual lubrication tasks where a threaded M10x1 connection is required. Practical for servicing bearings, joints and machinery in workshops and maintenance operations.