- Product Grade: Performance Part
- Brand: Spectre
- Fit Type: Vehicle Specific Fit
- OEM Part Number: 3991
- Triple chrome-plated steel top and base
- Made with pre-dyed synthetic media for lasting color
- Includes a stainless steel adjustable clamp
- 10 mm flange inside diameter
- Fits 3/8 inch to 1/2 inch (8-12mm) tubes
















Robert T. –
Great product for a small secondary filter, fitment and construction is A1. I’m using this as a replacement filter on 2019 Kawasaki Vaquero aftermarket Big Air Kit, the aftermarket maker sent a K&N (junk) with their kit. I put this Breather is on the backside of engine where the factory system was, great fitment, the worm gear clamp included is A1 as well. If you buy this Breather you’ll be very happy with the quality and performance.
Emmanuel Cerda –
This worked freaking amazing purchased it for my Nitro RC car. Looked awesome fit great and kept out dirt way better than the OE ones.
Amazon Customer –
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Timothy R. Bush –
Fit my 305 center bolt valve covers. Used it to replace the tube that connected to air cleaner.
C Thompson –
Nice quality
Cody Hudson –
Used it as a breather on my yfz450. Works perfectly.
Alex Klenklen –
Says its 9mm but its actually 10mm
wp –
As expected and on time.