This is a Picco P5TH Off-Road "Hot" Turbo Glow Plug.
Picco's P5TC On Road "Hot" Turbo Glow Plug
Picco's P6TC On Road "Medium" Turbo Glow Plug is suitable for use with on road
Picco's P6TC On Road "Medium" Turbo Glow Plug is suitable for use with on road
Picco's P7TC On Road "Cold" Turbo Glow Plug
Picco's P7TC On Road "Cold" Turbo Glow Plug