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SpeedFactory B Series Upper Fill Necks are designed to be used with custom radiator setups. These are made with high quality billet aluminum machined flange and filler neck. This changes the high point of the cooling system for easy fill of the radiator.
We offer these for B16 and GSR applications with stock 32mm Neck or -16an fittings
Radiator Cap sold separate
Upon Order please leave a note with which head the unit is for, B16 or GSR, and what inlet you would like, -16AN or 32mm standard tube.