• FAST & EASY IDENTIFICATION - Identifies o-ring sizes up to 13 inch inside diameter.
• EASY STORAGE - More compact than traditional cone shaped o-ring gauges, allows for easy storage.
• TOUGH AND DURABLE - Made of a rugged composite material to ensure a long service life.
• DIMENSIONS13-1/2" L x 1-1/2" W
• INSTRUCTIONS
  1. Place the o-ring in the top cross sections to determine the correct wall thickness.
  2. Place the o-ring on the protruding knobs of the gauge on the corresponding side of the correct cross section and slide until both sides of the o-ring are parallel.
  3. After the o-ring is parallel read the ARP dash number in the window.

NOTE: Do not clean with solvents or other harsh chemicals.