Collector Tethers Water Filler Neck Expansion Tanks

Collector Tethers Water Filler Necks are machined with a straight -12AN or -16AN female O-ring port in the front of the water filler neck. This port allows use of the proper size fitting for your application (-12, -10, and -8 fittings are sold separately). The design of Collector Tethers Water Filler Necks took a lot of time in order to ensure the radiator cap fit securely so the pressure seal and locking mechanism would perform well for extreme race conditions. A unique 1-pc billet aluminum top expansion portion bolts to the baseplate with O-ring seal & stainless steel cap screws; 1/4" push-lock overflow fitting also included. Choose a powdercoated black, polished, or raw finish. .