RADIATOR FILLER NECK BILLET for large cap 40mm

These billet weld-on fill necks are ideal for use wherever a heavy-duty, custom application filler neck is required. They feature a billet aluminium construction for durability in racing or street applications. These fill necks include barbed fittings for the plumbing of an expansion tank.||Suit a 508-13 Radiator caps and has a 1/8in NPT bleed port.