Differential or Radiator brass fill plug w/groove and "O" Ring

Replace junk plastic differential and radiator fill plugs with this metal plug.  Used in various Land Rover applications: commonly the plastic fill plugs crack on Discovery 2 differential fill plug, and the centers blow out of plastic bleed plugs fitted to original Range Rover Classic, Defender, & Discovery 1 as radiator fill plug. (Also fits MGB, 77--> as KTP9401)

Major thread diameter is about 21mm (.820").  Grooved for an "O" ring face seal, which is included:  Not a gasket-sealed type.  Some do and others do not have screwdriver slot in head:  Please call to order if this is important to you!

Plug is solid brass.  "O" ring is Buna N, 70D.