Rotary shaped oil cap and aluminium weld-on boss. Great for making custom catch cans, dry sump tanks, overflow bottles etc.
Both parts are CNC machined from billet 6061-T6 aluminium at our factory here in NZ.
Boss sits 15mm high, and has a 38mm diameter x 3mm long spigot on the bottom to locate into the tank it's to be welded to.
Total height of cap and weld-boss is 30mm.