For BG86 blower, there is a plastic protrusion that fits into the air filter housing. Compatible New high quality aftermarket carburetor for SH56 SH56C SH86 SH86C BG86 blower Replace C1M-S261B carburetor Replace Part Number: 4241 120 0616 Please note: This is a high quality aftermarket part and tested for maximum performance. Color: as shown Material: metal Package Contents: 2 x Carburetor 4 x Gaskets 4 x Primer Bulb 2 x Fuel Filter 2 x Fuel Line 2 x Spark Plug ignition Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.