1/8 " npt thread with recessed allan head. 1/8" npt has a nominal o.d. of 0.406" grade 6061t6 aluminum. Silver anodized aluminum.
NPT PLUGS 1/2" Hex Pipe Plugs Countersunk Style Male NPT Pipe End Fitting Cap US
Reducer 1/8" Female NPT to 1/16" Male NPT Pipe Adapter Brass Water Oil Gas M742
3/8" NPT Pipe Thread Allen Socket Steel block off x 100 Pipe Plugs
FRAGOLA 493202-BL BLACK ALUMINUM 1/8 NPT Pipe Plug- Internal
Industrial Water Pressure Pump - 1/2"NPT Pipe Thread Port Water Diaphragm Pump
1/8" NPT Pipe Plugs Aluminum w/ allan head 12 per pkg Red anodized aluminum
