Economy Glow Plug #3 (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.