Hole needed to be drilled to accommodate this neck is 30/32 mm OD. Because Our Necks have a wall thickness of 0.9 mm. Largest part of cap where the cap twists and locks onto.
Aluminium Weld-On Radiator Filler Neck + Brass Overflow Spout
Weld On Radiator Filler Neck With 1.1Bar Radiator Cap 30mm High Performance LW
Aluminum Weld on Header Tank Radiator Filler Neck 32mm 1-1/4" ID w/ Cap Natural
32mm 1-1/4" ID Aluminum Weld on Header Tank Radiator Filler Neck w/ Cap Natural
Land Rover Defender 200 / 300 TDi Brass Radiator Filler Plug + O-ring
Aluminum In Line Radiator Hose Filler Neck 1-1/4" 32mm Black With Radiator Cap
