Special Medium Heat Novarossi Glow Plug. Typically used in .28 and larger displacement engines with 10% - 25% nitro. Not compatiable with Cesare Rossi (CR) or Novarossi helicopter engines that utilize a short body HR series plug. 1 plug. Also not for use in turbo engines. Use plugs that have a T in their number for engines with turbo heads.
Novarossi Rex C6S Glow Plug