The Jet Holder is an OEM part for Bosch ranges. It is responsible for securely housing components that generate flames and distribute heat across the cooktop surface. The jet holder ensures proper airflow and fuel ignition during operation. Symptoms of a bad jet holder include: Unsteady or unstable flames during cooking   Flames that cross-ignite between burners Inefficient heat transfer causing slow cooking times Loose, damaged, or missing jet holder components Causes of a bad jet holder can include cracks developing from excessive heat cycling or debris buildup restricting gas/airflow. Mineral deposits may also cause fittings to warp and lead to improper alignment.  This OEM Bosch part is also compatible with Thermador, Gaggenau, and some Kenmore models.00415498 (AP2832927) replaces 00421674, 1021753, 15-10-156, 415498, 421674, AH3460980, EA3460980, PS3460980, PS8711296.