3M 26432, PPS Series 2.0 Sealing Plug, 96 plugs per pack, 7100135627 
Insize 4131-1B1, AMERICAN STANDARD THREAD PLUG GAGE, 1/4-20UNC, 6928640358944
$87.51
Class 2B.
Standard ANSI/ASME B1.2
Supplied with Go and No-Go gages together
Supplied with manufacturer inspection certificate.
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