How to grease zerk fittings

using a zerk fitting and grease gun?

Removing grease zerk

World's Smallest Grease Gun Coupler (Only 0.53 ") with Cleaning Tool, High Pressure Quick Release Grease Tips,Fit All 1/8" NPT Manual/Electric Grease Gun, for Greasing Locks onto Zerk Fittings

LockNLube 8-Piece Quick Connect Greasing Accessory Kit. Complete grease fitting connection kit. Reach any grease fitting on any machine. The rip-stop case keeps tools clean and portable.

Grease Gun Coupler, Locks onto Metric and SAE Zerk Grease Fittings, Positive Lock, Fits All 1/8” NPT Type Grease Guns, Quick Disconnect Lever, 10,000 PSI High Pressure, by Tech Team