Economy Glow Plug #4 (twin pk)

Supplied in packs of 2 pcs

#3 is medium  for mid sized engines using medium nitro fuel

#4 is medium cold for hi compression/hi rpm using low nitro fuel

#5 is cold for hi compression/hi rpm using medium nitro fuel

#6 is cold for large engine medium nitro

Temperature range approx of enya glow plugs.