Hose And Pipe Thread ID Gauge Card
A 150 x 60 x 3 mm gauge card that identifies a hose or pipe thread. It has four 60-60 mm thread combs: 11.5 TPI (2.21 mm, used by garden hose GHT and 1" NPT), 14 TPI (1.81 mm, 1/2" and 3/4" NPT/BSP), 18 TPI (1.41 mm, 1/4" and 3/8" NPT) and 1.5 mm metric (M22 pressure washer). Three U-notches check male thread OD: 21.6 mm for 1/2" NPT, 27.3 mm for 3/4" NPT/GHT and 33.7 mm for 1" NPT. With it you can tell which adapter to buy before you go to the hardware store.
tool thread-gauge garden-hose npt