If the auto parts store doesn't have one a hardware store will. If you still have the metal line you'll be looking for a compression/NPT fitting. They usually have them in a display where you can visually compare your old one to the new one.
Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.
| 
