Spark Exhaust Lambda Sensor Cap M12 × 1.25 Stainless Steel Drilled TAPPO018
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An M12 × 1.25 sensor cap in AISI 304, drilled. Seventeen euro against five for the brass plug, and a different part for a different purpose.
Key Features
- Lambda sensor cap, M12 × 1.25 thread.
- AISI 304 stainless steel.
- Drilled.
- Spark part number TAPPO018, made in Mantova, Italy.
Stainless Against Brass
Spark makes two ways to close an M12 boss: the brass plug TAPPO017 and this stainless cap. Brass is cheaper and comes out easily. Stainless matches the pipe, does not discolour beside it, and is the correct choice where the boss is never going to carry a sensor again.
Drilled
Spark's price list describes this cap as having holes. It is not a blank plug — which matters if your requirement is a fully gas-tight seal rather than a tidy closure.
If you need the boss completely sealed, the brass plug is the article to order. If you are unsure which your system needs, tell us what the boss is for and we will say.
The Thread
M12 × 1.25, which is the fine pitch used on the smaller sensor bosses. It is not the same as an M12 coarse thread from a hardware shop and will not interchange with one.
Ordering
One per boss. The M18 × 1.5 version of the same part is TAPPO019.
| Part number | TAPPO018 |
|---|---|
| Type | Lambda plug |
| Material | AISI 304 stainless steel |
| Dimensions | M12 thread |
| Fitment | Universal |
| Road approval | None — track use only |
| Thread | M12 × 1.25 |
| Origin | Made in Italy |
| Manufacturer | Spark Exhaust Technology, Mantova |
| Manufacturer description | Plug M12 - with holes - stainless steel |
Universal product — Please check whether it fits your bike.
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// Spark Exhaust
Spark Exhaust Lambda Sensor Cap M12 × 1.25 Stainless Steel Drilled TAPPO018

Tech specs
- Part number
- TAPPO018
- Type
- Lambda plug
- Material
- AISI 304 stainless steel
- Dimensions
- M12 thread
- Fitment
- Universal
- Road approval
- None — track use only
- Thread
- M12 × 1.25
- Origin
- Made in Italy
- Manufacturer
- Spark Exhaust Technology, Mantova
- Manufacturer description
- Plug M12 - with holes - stainless steel
- Worldwide shipping
- Genuine parts & verified quality
- 14-day returns — in stock ships within 24h
- Personal email support
// Support
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