Petrol Tap Size Guide
In order to determine the gas thread needed please see the guide below:
| Gas Thread | Measurements |
| 1/8″ Gas | 3/8″ dia x 28 TPI |
| 1/4″ Gas | 1/2″ dia x 19 TPI |
| 3/8″ Gas | 21/32″ dia x 19 TPI |
| 7/16″ Gas | 7/16″ dia x 19 TPI |
TPI = Threads per Inch