Needle valves come in various types, the main differences being size of orifice and tip material.
The most popular had a brass body with a spring loaded, stainless steel tip, mounted in a nylon needle and would withstand a pump pressure of about 6psi. Now are all fitted with a VITON tip.
Newer carburetters are often fitted with a VITON tipped brass needle in a brass body and will withstand a pressure of about 10psi.
All of our needle valves are air tested and are far superior to the steel ball type which are cheap but make lots of money for suppliers.
