Fuel pressure regulator and fuel filter(BMW E46 2001–2006)

There are 4 interchangeable 10–32 threaded vacuum port fittings provided to cover all scenarios:

1. Barbed fitting: A black zinc-plated 3/16″ (5 mm) barb, machined from high-strength steel. Compatible with the following vacuum hoses: 5/32″ (4 mm), 3/16″ (5 mm), and 7/32″ (6 mm).
2. 3AN male fitting: A black zinc-plated adapter, machined from high-strength steel, compatible with 3AN hose ends.
3. Push-to-connect: A nickel-plated brass fitting with Buna-N O-rings, compatible with 1/4″ OD hard plastic tubing.
4. Vacuum plug: A black oxide stainless steel screw used to maintain constant (non-dynamic) fuel pressure.