Taperpipe NPTF Plug Gage 6-StepNPTF 6 step plug inspects the crest truncation or profile of the
internal threads and is used in conjunction with L1 plug

• NPT L1 plug inspects the functional size or hand tight engagement of couplings or an internal thread
• NPTF L1 plug inspects the functional size or hand tight engagement of couplings or an internal thread
• NPTF L3 plug inspects the wrench engagement and taper of couplings or internal threads and is used in conjunction or relationship with the NPTF L1
• NPTF 6 step plug inspects the crest truncation or profile of the internal threads and is used in conjunction with L1 plug
• NPT pipe thread plug and ring gages are manufactured per ANSI/ASME B1.20.1
• NPTF gages are manufactured per ANSI/ASME B1.20.5
• Free NIST certificate of accuracy