Based on this product's specifications, here are some alternatives and similar models
Air gun fitting PARTNER PA-MH08/04 external thread 1/2" 6 mm saw-tooth (jodełka)
Summary description:
Replacement pneumatic fitting by PARTNER, model PA-MH08/04, with external 1/2" thread and 6 mm saw-tooth (jodełka) barb. Designed for connecting 6 mm air hose to tools, compressors or pneumatic systems; provides secure hose grip via the jodełka profile and a standard 1/2" threaded connection for valves or couplings. Suitable for workshop repairs, pneumatic maintenance and hose assemblies.