The SP-KFA1009 spark plug was used on 120-400K btu oil fired Dyna Glo,

Workhorse and Thermoheat oil fired heaters

The white porcelain is 1 1/2" long by 1 1/4" wide

Dura-Heat: DFA-120, DFA-170T, DFA-210

Dyna-Glo: KFA-120, KFA170T, KFA210

Dyna-Pro: KFA-120T-Pro, KFA-170T-Pro, KFA-210T-Pro

WorkHorse: KFA-120WH, KFA-120WH-03, KFA-170WH,

KFA-170WH-03, KFA-210WH, KFA-210WH-03 

SAME DAY SHIPPING ON ORDERS PLACE BEFORE 2:00PM EASTER TIME