











O-Ring between thermostat housing and cylinder head
2X Entries For Our G87 M2 Sweepstakes!We Price Match – Give Us A Call or Chat!
$3.80
2X Entries For Our G87 M2 Sweepstakes!We Price Match – Give Us A Call or Chat! O-Rings have multiple purposes and are very important to your vehicle’s health and functionality. Whether you need a replacement for your Thermostat Housing, Plastic Bypass Pipe or Cooling Sensors, ECS Tuning has the part for you. Stop leaks before they happen, replace your worn O-Rings at the first sign of wear, or while you're working on your cooling system.
917.931
| Mfg Part # | 021121119A |
|---|


Covers the thermostat, located on the coolant flange
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Keeps chain tight.
10X Entries For Our G87 M2 Sweepstakes!


Fix that oil leak for good!


Ensure a proper seal when installing your new thermostat. 50×4


Breather hose from front of block to valve cover