The white porcelain is 1 1/2" long by 1 1/4" wide.
SP-KFA1009 Spark Plug was used on 120-400K btu oil fired heaters.
Package Includes 2pcs SP-KFA1009 Spark Plugs
Compatibility:
Fits for Dyna-Glo/ Dyna-Pro/ Dyna-Glo Pro/ Dura-Heat/ ProTemp/ HeatHog/ Remington/ Master/ HeatStream/ Dayton/ WorkHorse
for Dura-Heat: DFA-120, DFA-170T, DFA-210
for Dyna-Glo: KFA-120, KFA170T, KFA210
for Dyna-Pro: KFA-120T-Pro, KFA-170T-Pro, KFA-210T-Pro
for WorkHorse: KFA-120WH, KFA-120WH-03, KFA-170WH, KFA-170WH-03, KFA-210WH, KFA-210WH-03