Reddit reviews 6 Pieces Metric Grease Fitting M8 x 1.25 M8X1.25 Zerk Nipple Steel Straight
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Metric Grease FittingsMaterial: Zinc Plated SteelFitting Thread: Metric M8X1.25Package Quantity: 6Straight
https://www.amazon.com/Pieces-Metric-Fitting-M8X1-25-Straight/dp/B07DW29TYM
They are a fitting with a 1 way ball valve, they allow a grease gun to clip on and pump grease through them into where ever that needs grease.