This is a chamber insert for the Volcano Solid Valve chamber for your Volcano Digit or Classic vaporizer.
This insert is basically the top screen of the Solid Valve herb chamber and it goes on the top of your herbs to cover your chamber before you clip on the balloon valve.
The insert allows you to add as small or as large amount of herbs as you can fit as it slides on the top of your herbs regardless of quantity.
You must have this piece in place for your vaporizer to work. If you have misplaced this part, your solid valve chamber does not function properly without blowing all your herbs into your balloon.
This is an original Storz and Bickel part, made in Germany from food grade stainless steel.