Fuel filter, This is the canister type.

To fit
Engine codes 1.8 JH, 1.6 EN
Mk1 Golf Cabriolet JH, KT, DX engine up to chassis number >>15-E-011 290

Why does my fuel filter need to be replaced?
Your engine's fuel filter removes dirt, rust, water and other contaminants from the fuel entering the engine. It could become blocked if not serviced
.
What happens if it's not replaced?
Clean fuel is vital for your car's engine to perform efficiently.
Failure to replace the fuel filter when needed could lead to a drop in performance and could mean your car won't start.

How often does it need to be checked?
At the recommended age or mileage limit.

Benefits of having my fuel filter replaced
1. Optimised engine performance and fuel economy
2. Maintains the mechanical integrity of the engine