Spark Plug Thread Adaptors 18mm down to 14mm Steel (M14 & M18)

The Spark Plug Thread Adaptor converts 18mm plugs down to 14mm for reliable compatibility across a range of engines. Crafted in steel for durability, this adaptor is ideal when long reach 14mm plugs are required, as the seated shoulder raises the plug out of the chamber for easy installation and optimal positioning. Available in M14 with a 1.25mm thread pitch and M18 with a 1.5mm pitch, it ensures precise threading and secure seating. This adaptor complements other spark plug fittings and can be paired with brass variants if preferred. Perfect for technicians seeking a robust, versatile solution to fit diverse ignition systems and extend plug accessibility in tight spaces.