Recoil AP4 4-Inch Aero Port Kit, Flared Bass Tube ABS Material Flares

Car Audio enthusiasts use aero ports for an easy way to install and adjust the length of the port for tuning an subwoofer enclosure. They can be used inside or outside of the enclosure depending on what best fits your application. For Recoil Audio 4" port, it has an interior diameter of 4" with a heavy-duty cardboard pipe length of 12”. From here you can adjust the length of the port down by cutting the pipe to your desired length. This product comes with a piece of cardboard pipe Specifications: Inner Diameter 95mm (3.74") Flare Outer Diameter 188mm Mounting Cutout 151mm Pipe Thickness 5.8mm Pipe Length 300mm (11.8") Total Length 425mm (16.7") Max RMS Power 750W+ Airflow Capacity 32 CFM

• Flared Design: Proprietary aerodynamic flares reduce air turbulence by 70% vs. standard tubes, eliminating "chuffing" sounds.
• Distortion-Free Lows: Experience punchier, deeper bass without unwanted noise pollution.
• Adjustable Length: Cut the heavy-duty reinforced cardboard pipe (12" included) to any size for perfect box tuning.
• Cut-to-Fit Flexibility: Recoil’s AP4 aero port seamlessly integrates with standard 4-inch PVC pipes (readily available at US hardware stores). Customize vent length in minutes for perfect bass tuning.
• 5.8mm Cardboard Core: 2X thicker than competitors (industry avg: 2.5mm) resists box compression. ABS Flare Armor: 3.2mm wall thickness survives 200+ lbs pressure | Humidity-proof
• Precision Fit: AP4: 95mm ID / 151mm Cutout. Zero-Gap Seal: Beveled edges lock flush with enclosure walls