Kit includes the following:

• (1) Lustre Craft Knob
• (1) Washer with small hole for smaller diameter weld heads.
• (1) Washer with large hole for larger diameter weld heads.
• There is no vapor technology built into the knob kit.

This knob will replace the older knob (P161-19) shown in the photo.  Only use one of the washers and discard the other one.