The Supertech titanium black-nitrided exhaust valve for Honda K20 and K24 engines is supplied as a single replacement valve. The description specifies titanium construction with a black nitride finish; this valve is intended for exhaust-side replacement in the K-series engines listed and is sold individually for targeted valve repair or upgrade.
Supertech Honda K20/K24 Titanium Black Nitrided Exhaust Valve - Single (Drop Ship Only)