Earl's Performance Products was founded by Earl Fouts in 1955 in Lawndale, California. The mission was to supply high-quality military aircraft surplus plumbing components directly to the racing industry from a small retail outlet. As the military surplus market dried up, Earl recognized the need for continuity of supply for the racing market and pioneered the Earl's range of hoses and fittings that are still used today. In doing so he created the racing aftermarket plumbing industry.
| A/N Size | N/A |
| Adapter NPT Size ( A ) | 1/4 NPT FEMALE |
| Adapter NPT Size (A) | 0.250 in. NPT Female |
| Adapter Type | Weld Bung |
| Diameter | .786" |
| Emission Code | 5 |
| Finish | Natural |
| Height | .667" |
| Material | Mild Steel |
| Outside Diameter | .865" |
| Part Type | Oxygen Sensor Bung |
| Product Line | Premium |
| Thread Size | 1/4NPT |
| Weld Base | Round |
