Radiator Hose Filler.
Machined from 6061-T6 billet aluminium, Aeroflow radiator hose fillers are designed to be used in the top radiator hose to provide a complete coolant system fill. Machined with 2x 1/8" NPT ports for water temp or pressure gauges. Available in polished or black anodised finish and made to suit 38mm (1-1/2") size radiator hose and accepts Aeroflow Large style radiator cap (AF64-5042, sold separately).