Cummins 4334080 — Cylinder Head Gasket, STD, KT19 / KTA38 / KTA50 / QSK19 / QSK38 / QSK50. The cylinder head gasket is one of the most critical sealing components in a diesel engine. Compatible with Cummins KT19, KTA19, KTA38, KTA50, QSK19, QSK38, and QSK50 engines.