3/4" NPT X 14MM TAPERED SEAT
- 1-1/16" Hex Diameter
- 3/4" NPT Pipe Thread Diameter (Outside)
- 14mm Thread (Inside)
- Fits some engines built before 1925
1/2" NPT X 14MM TAPERED SEAT
- 7/8" Hex Diameter
- 1/2" NPT PipeThread Diameter (Outside)
- 14mm Thread (Inside)
- Fits most engines built before 1925
18MM TAPERED SEAT x 14MM TAPERED SEAT
- 7/8" Hex Diameter
- 18mm Thread Diameter (Outside)
- 14mm Thread (Inside)
- Fits Ford Y-Block V8
18MM FLAT SEAT x 14MM TAPERED SEAT (EXTENDED)
- 7/8" Hex Diameter
- 18mm Thread Diameter (Outside)
- 14mm Thread (Inside)
- Fits Allison V12 Engine
18MM FLAT SEAT X 14MM FLAT SEAT (SHORT)
- 7/8" Hex Diameter
- 18mm Thread Diameter (Outside)
- 14mm Thread (Inside)
- Fits Continental Engines & Special Applications
7/8" FLAT SEAT X 14MM TAPERED SEAT (STANDARD)
- 1" Hex Diameter
- 7/8" Thread Diameter (Outside)
- 14mm Thread (Inside)
- Fits most engines built between 1925-1939
18MM FLAT SEAT X 14MM TAPERED SEAT (STANDARD)
- 7/8" Hex Diameter
- 18mm Thread Diameter (Outside)
- 14mm Thread (Inside)
- Fits most engines built between 1939-1970
High quality sparkplugs are hard to find for older gasoline tractors and engines, sparkplug adapters solve this problem. The adapters allow the use of 14 mm automotive sparkplugs in engines that require larger sparkplugs. Automotive sparkplugs are more robust and readily available.
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Click "INFORMATION" tab for tractor application guide.
Spark Plug Adapters
