Specifications:

End Diameter:  18mm
Thread Size:  G 1/4" (BSPP)
Materiel:  Nickel Plated Brass
Thread Length:  ~5mm
Total Length: 10mm
Fitting Type:  Threaded Plug w/recessed o-ring
Quantity:  1 Plug (Yes, these are sold INDIVIDUALLY!)

Description:

A simple G 1/4" threaded plug from Danger Den. Uses a standard 1/4" Allen Wrench for tightening.