Description
Overview:
The Prefilter for Stihl SR340 and SR420 blowers is a Genuine Stihl part designed to protect the engine by trapping larger dust and debris before it reaches the main air filter. Made from durable, open-cell foam in a dark grey finish, it sits in the intake path to improve airflow quality and extend the life of the primary filter. Correct for OEM No. 4203 120 1500, it maintains consistent performance in backpack blowers and sprayers used in landscaping, grounds maintenance, and agriculture. By reducing dirt ingress, it helps preserve engine health, reduces wear, and supports easier starts. This prefilter is a straightforward replacement for routine servicing on tools such as the SR340 and SR420.
Key Features:
- Genuine Stihl part for assured fit and reliability (OEM No. 4203 120 1500)
- Tough open-cell foam construction for effective pre-filtration and durability
- Helps protect the engine by capturing coarse dust and debris before the main filter
- Supports steady airflow to maintain performance and fuel efficiency
- Extends service intervals of the primary air filter and reduces maintenance time
- Simple to fit and replace as part of regular servicing
- Suitable for professional and domestic use in dusty environments
Typical Applications:
Used as a first-stage air filter on Stihl backpack blowers and mistblowers operating in gardens, estates, farms, building sites, and municipal areas. Ideal where leaf, grass, soil, or construction dust is present. Regular replacement helps keep engines cleaner, reduces clogging of the main filter, and supports reliable day‐to‐day use.
Also known as:
Foam pre-filter element, intake pre-cleaner, blower pre-filter pad, dust pre-filter, filter foam insert, intake foam element.
Fits Models:
BR 340, BR 340 L, BR 380, BR 420, BR 420 C, SR 340, SR 420
Alternate Part Numbers:
4203-120-1500, 42031201500, SL 1151, SL1151
Product Specifications
| L&S Part No. | 4203 120 1500 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 42031201500 |
| Unit of Sale | 1 |
| Applications | BR 340, BR 340 L, BR 380, BR 420, BR 420 C, BR340, BR340L, BR380, BR420, BR420C, SR 340, SR 420, SR340, SR420 |
| Machine Type | Backpack Blowers |
| Fits Brands | Stihl |
| Fits Models | SR 340, SR 420 |
