O'Donnell Medium (Purple) Sport Glow Plug (25%-30% Nitro) (1)

You really can't go wrong with O'Donnell! Does its job and has lasted through break-in!)

Great plugs! Only ones I use. They work great in my dynamite big block engines and others.)

I have run this plug in all my nitro engines and it works wonderful. I have six big block engines from a torq 21 to Axail 32.)

Do not bother I purchased 15 of them a few years back,used O'Donnell 20% nitro fuel every plug I received either the elements fell off into motor scared piston and sleeve used them on nova rossi, rossi,ops,picco, no luck. And one werks)

I used to only run OS plugs, but I now think these Odonnell purple plugs are better. For any SH-based engine - LRP, SH, Dynamite, Mach, Nosram, Losi 454 or whatever - they give good performance, they're steady and reliable, and they last long. And oh yeah - they're cheap!.. For me these are the best non-turbo plug you can get - regardless of cost.)

I've had this glow plug for 6 months and have ran at my practice track at my grandpa's which is a fast pace, on and off throttle, little break time race when i practice and this glow plug is AMAZING! It has amazing throttle response in humid, dry, hot, and even cold weather. I have mostly been running it with my Dynamite Mach .21 2 and i have only changed it once after break in. If you want the best priced Glow plugs out there and can perform, get these!!!)

I've havnt changed a glow plug in 14 months. Its the first glow plug i put in the motor. The motor is a Axial .32rr runs great. These are the right ones for it....)

I have used these and also No. 99 plugs in my nitro engines..you can't really fail w O'Donnell glow plugs)