Pressure Kettle is a 
Daedalus Grenade
Its special effect is Diamond Hands - Throws 5 Divider grenades. Cooking the grenade increasaes the Damage it deals and reduces the number of projectiles thrown.
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How to Unlock The Legendary Pressure Kettle Grenade
Ordnance
Legendary Loot
Overview
How To Unlock
Unlock Location:
- Activate The Desert Dreams, Vault Card.
- Earn Points by completing challenges and leveling up.
- Once you have enough points you will be able to purchase the Pressure Kettle from the Vault Card.