The Supertech Inconel exhaust valve is a +1mm oversize single for Nissan SR20D engines. Supplied one-per-order, the oversize specification supports valve seat work and rebuilds where an upsized exhaust valve is required. The listing indicates the part is sold individually and available via drop-ship.
Supertech Nissan SR20D Inconel Exhaust Valve - +1mm Oversize - Single (Drop Ship Only)