This is the ProTek R/C Gold O.S. P3 "Ultra Hot" Turbo Glow Plug, the exclusive plug of the Samurai 321B Nitro Engine. The ProTek R/C P3 plug is designed for use in most .18 - .28 off-road turbo head engines such as O.S., RB, Novarossi, Werks and Orion. This P3 variety provides ultra hot operation for optimal idling and acceleration. Package includes one plug.

 Features:

• Easier to tune
• More low-to-middle range power
• Quicker throttle response
• Faster acceleration
• Better mileage
• Crisper idling
• Increased longevity