The original Mercedes fittings are made from plastic and usually fail due to high/cold temperatures cycles
Oem replacement parts offered are the complete hoses with fittings (not reasonable price)
So we offer you the set of 3 fittings CNC made from brass. they are bulletproof and can't fail
2 straight fittings are attached to the top of coolant reservoir
1 90deg fitting is attached to the top radiator pipe.