Spark Exhaust Copper Sealing Washer 12 × 18 mm for M12 Plug Universal ROND12X18R
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A copper washer, twelve millimetres by eighteen, one euro. It seals the M12 lambda plug and nothing else in Spark's range needs it.
Key Features
- Copper sealing washer, 12 × 18 mm.
- For Spark's M12 lambda plug, article TAPPO017.
- Spark part number ROND12X18R.
Why Copper
Copper is soft enough to deform into the surface irregularities of a boss and stable enough to stay sealed at exhaust temperature. It is the standard sealing material for threaded exhaust fittings for exactly that reason.
A Consumable
A crush washer seals by being crushed. Once it has taken the shape of one joint it will not seal another as well, and reusing one is the usual reason a plug that was tight last year ticks this year. At one euro there is no argument for it.
Twelve by Eighteen
Twelve millimetres inside, eighteen outside. The inner figure has to match the plug's thread and the outer one has to cover the sealing face on the boss — a washer that is too small in either direction seals on nothing.
Ordering
One per plug. If you are ordering TAPPO017, order this alongside it — the plug does not come with one.
| Part number | ROND12X18R |
|---|---|
| Type | Lambda plug |
| Material | Copper |
| Fitment | Universal |
| Road approval | None — track use only |
| Size | 12 × 18 mm |
| Origin | Made in Italy |
| Manufacturer | Spark Exhaust Technology, Mantova |
| Manufacturer description | Washer for Plug Tappo017 |
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// Spark Exhaust
Spark Exhaust Copper Sealing Washer 12 × 18 mm for M12 Plug Universal ROND12X18R

Tech specs
- Part number
- ROND12X18R
- Type
- Lambda plug
- Material
- Copper
- Fitment
- Universal
- Road approval
- None — track use only
- Size
- 12 × 18 mm
- Origin
- Made in Italy
- Manufacturer
- Spark Exhaust Technology, Mantova
- Manufacturer description
- Washer for Plug Tappo017
- Worldwide shipping
- Genuine parts & verified quality
- 14-day returns — in stock ships within 24h
- Personal email support
// Support
Frequently asked questions
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