This is a Dyson replacement tension spring, SKU 900199-06. The manufacturer's parts listing describes the 900199-06 as a dust bin catch spring, the small spring that holds tension against the catch so the bin stays locked to the machine until you release it. Dyson has used the 900199 base number across more than one spring, separated only by the digits after the dash, and those springs sit in different assemblies on different machines. The suffix is therefore the part of the number that decides what you receive, so read it carefully against your own parts diagram rather than matching the base number alone. A spring that has lost tension, stretched, or snapped shows up as a catch that will not hold, a bin or door that drops open on its own, or a release that stays down instead of springing back. Springs are inexpensive and awkward to reach once the machine is reassembled, so it is worth fitting a new one while you already have the assembly open. Part: Dyson replacement tension spring, SKU 900199-06 Function: Holds return tension on a catch so it latches and releases cleanly Replace when: The catch will not hold, or the release stays down instead of returning Before ordering: Open your model's parts diagram and confirm the full number, 900199-06, against the spring you are replacing
