"**What this part does**
Blocks off an unused port or passage in the compressor so the casting is sealed where no working valve is needed.
**Where it is installed**
The Dummy Valve (Block-Off Valve) is located in the compressor port or cylinder-head passage that is not used on this application.
**Symptoms of a failed dummy valve**
A worn or damaged dummy valve shows up as one or more of these symptoms:
- Oil or refrigerant weeping from the port where the dummy valve should seal
- Missing or loose plug after a rebuild
- Damaged sealing face or thread
**When to replace**
Replace if the plug is missing, loose, or its sealing face or thread is damaged.
**Why choose this part**
Supplied as a direct replacement for the original part. Always compare the dimensions, hole layout and finish with your original part before ordering.
**Ordering note**
Confirm the thread and sealing style match the original dummy valve before ordering.
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