When a spark plug port gauges as undersize, it will be necessary to try and clean-out the port to verify if the port has been manufactured undersize or has become undersize through the accumulation of operating debris.

The Stitt Spark Plug Port Clean-Out Brush System offers a specialized steel, fine wire brush for the common, industrial engine spark plug port thread sizes (14mm, 18mm, 7/8"-18 ).

The brush must be fitted into our universal holder. For deep spark plug well applications, an extension holder is available that is six (6) inches long. These extensions can be combined for spark plug wells that are deeper than six inches.

(For specific engine applications, see page 11 of the STITT Professional Spark Plug Installation Manual for Integral Compressor Engines, PSIM / 8-99) or click on link below.