Note - these are not actually NPT, they are SAE bolt thread, but people look for them as NPT because all of the other larger sizes are NPT. Second picture is the tool you use to grease (tool is not included).
Bleu Prevost 1/4" NPT Female Air Coupler (5) Pack - IRC061201
5 PACK OF 18 INCH GREASE GUN FLEX WHIP HOSE EXTENSIONS W/BRASS 1/8-INCH NPT ENDS
Milton 1803 P Style Air Hose Fittings Couplers 5 PACK 1/4" NPT
Grease Needle Nozzle Tool, 5-Pack NPT Thread and Rubber Tip Small Spaces
4 Gallon Steel Air Tank - 30" Long (5) 1/4 NPT Ports
