Provides the ideal way to fill the system and purge the air in applications where no other means are possible. CNC machined from 6061 billet aluminum for the cost of others cast aluminum kits. Includes a 1/8" NPT x 5/16" hose overflow fitting. Total height is only 2.75" and the overall length is 4.5". Just add a radiator style pressure cap and go. Available in five hose configurations and either clear anodize or polished finishes. Made In USA