3/8 " npt thread with recessed allan head. nominal o.d. is 0.675" +/- grade 6061t6 aluminum. Pair of pipe plugs (2) pcs. Silver anodized aluminum. Professional Quality.
NPT PLUGS 1/2" Hex Pipe Plugs Countersunk Style Male NPT Pipe End Fitting Cap US
5x 3/8 NPT Pipe Plugs Male Thread Allen Socket Hex Countersunk Plugs block off
3/8" NPT Pipe Thread Allen Socket Steel block off x 100 Pipe Plugs
1/8" NPT Pipe Plugs Aluminum w/ allan head 12 per pkg Red anodized aluminum
1/8" NPT Pipe Plugs Aluminum w/ allan head 12 per pkg Blue anodized aluminum
1/4" NPT Pipe Plugs w/recessed allan head 12 per pkg Red anodized aluminum
