This is a locking copper manifold nut for all Fiat and Lancia cars. This unit is a real problem-solver. M8x1.25 thread, it fits most all Fiat and Lancia vehicles for mounting intake and exhaust manifolds to the cylinder head, and also carburetors to the intake manifold.
12mm hex size allows for easier installation and removal in tight spots.
Copper alloy construction means it will not rust itself to the manifold stud if disassembly is required at a later date.
Self-locking, these can be used without lock washers.
We use these on all of our service work and our race cars.
Note: Photo shows two pieces for illustration purposes. These are sold individually.