Weld-on boss to suit our rotary shaped oil filler caps and standard Mazda oil filler caps. Great for making custom catch cans, dry sump tanks, overflow bottles etc.

The weld-on bosses are available in 6061-T6 aluminium and 304 stainless steel.

They sit 15mm high, and have a 38mm diameter x 3mm long spigot on the bottom to locate into the tank it's to be welded to.

Please note the rotary shaped oil cap pictured is not included in this listing, but check our other listings for oil filler caps and combo deals for weld-on bosses with caps.

Parts from Franklin Engineering Ltd. are such a great price because we are designers, the manufacturers and the seller of the parts - there is no middleman or resellers. You're buying top quality direct from the manufacturer.