Article Code                 Diameter                    Connection Thread

HJ-4021                       ¢27                             M10×1-12.5

HJ-4022                       ¢27                             1/8NPT

HJ-4023                       ¢23                             M10×1-12.5

HJ-4024                       ¢23                             1/8NPT

powder fire extinguisher pressure gauge