Aluminium Header Tank

The tank has been designed as a direct replacement of the standard, late model E30 plastic header tank: 

It is the same size and shape to maintain the same fluid capacity, and to allow already routed and installed hoses the same clearance as before.

Tank Drawings (click to enlarge):

The aluminium radiator filler neck was purchased from Randall Motorsport.

The sight glass is made up of two food grade, stainless steel 1/4" BSP / 8mm pnumatic hose fittings (from Context Pneumatic Supplies) with a length of 8mm OD Acrylic tube (from The Wholesale POS Co) running between them.

The Stainless steel pressure cap was sourced from Bad Boy Classics