The Tecalemit HF4048 is a high pressure 4 jaw grease coupler with no rubber seals, so it delivers grease at higher pressures over a longer period than many other connectors that rely on rubber seals that wear and tear. Designed to provide a high pressure seal on quality grease nipples meeting US Military and DIN specifications the HF4048 is designed to perform when it counts. Gold passivated for corrosion protection and easy identification. 1/8" BSP coonection thread.