Using Pipe Ring & Plug Thread Gages
NPTF (Dryseal) 3 and 6 Step Gages
Ring Gages

If L1 ring goes on to the maximum notch

The L2 ring must also go on to the maximum notch within 1/2 turn

and the six step plain ring must go between the MX and MXT notch.

If L1 ring goes on to the basic notch

The L2 ring must also go on to the basic notch within 1/2 turn

and the six step plain ring must go between the B and BT notch.

If L1 ring goes on to the minimum notch

The L2 ring must also go on to the minimum notch within 1/2 turn

and the six step plain ring must go between the MN and MNT notch.
