This item is acquired in-game. See its sources below.
An Uncommon Cloth Waist, item level 40, binds when picked up.
First seen in build 12.0.7.68887 (Midnight (patch 12.0.7)).
In the Appearances collection, Steamburst Cord is listed as Quest. Appearance ID: 21969. 5 other items wear the same appearance:
Read from the World of Warcraft client build files.
4 quests list Steamburst Cord among their rewards in Blizzard's quest data.
Foundry-Fired Plate Girdle, 
Wildwood Wrangler Belt, 
Overgrowth Cutter BeltFoundry-Fired Plate Girdle, Wildwood Wrangler Belt, Overgrowth Cutter BeltFoundry-Fired Plate Girdle, Wildwood Wrangler Belt, Overgrowth Cutter BeltFoundry-Fired Plate Girdle, Wildwood Wrangler Belt, Overgrowth Cutter BeltRead from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
Cloth is the armor type Mage, Priest and Warlock wear. With Intellect, Steamburst Cord suits Discipline, Holy and Shadow Priest; Arcane, Fire and Frost Mage; Affliction, Demonology and Destruction Warlock.
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Steamburst Cord uses icon file 937854, which 17 other items also use. The 4 closest by item ID:
Auchenai Keeper Cord ID 112534 · Armor - Cloth · item level 42Firefly Cord ID 114275 · Armor - Cloth · item level 44Fine Void-Chain Cinch ID 109074 · Armor - Cloth · item level 40 "The tiny links of this belt reflect no light."Karabor Sage Cord ID 107318 · Armor - Cloth · item level 40Blizzard numbers items as they are created, so the named items next to ID 112613 (112608 to 112618) were usually added in the same batch as Steamburst Cord: the same quest line, zone, vendor or reward set.
Overgrowth Cutter Spaulders ID 112608 · Armor - Leather · item level 40
Foundry-Fired Plate Shoulders ID 112609 · Armor - Plate · item level 40
Steamburst Mantle ID 112610 · Armor - Cloth · item level 40
Wildwood Wrangler Monnion ID 112611 · Armor - Mail · item level 40Foundry-Fired Plate Girdle ID 112612 · Armor - Plate · item level 40Wildwood Wrangler Belt ID 112614 · Armor - Mail · item level 40Overgrowth Cutter Belt ID 112615 · Armor - Leather · item level 40
Steamburst Wristwraps ID 112616 · Armor - Cloth · item level 40
Foundry-Fired Plate Wristwraps ID 112617 · Armor - Plate · item level 40
Wildwood Wrangler Wristwraps ID 112618 · Armor - Mail · item level 40The raw ItemSparse values for item 112613 in the current client build.
Read from the World of Warcraft client build files: Item, ItemSparse, Lock, Holidays, AreaTable and CollectableSourceVendor.
TheWoWDB