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Monacor MBR-45 Bass reflex port 62 mm Inside diameter:45 mm | Conrad.com
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Unique Bargains Car Subwoofer Woofer Port Box Bass Reflex Air Tube Fits for 6.5" 8" Speaker - Walmart.com
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Amazon.com: Kalevel 2 Pcs Speaker Box Port Tube Bass Reflex Speaker Box Parts Replacement Bass Port Hole Accessories Components for Sound System Car : Electronics
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Monacor BR-60TR Bass reflex port 140 mm Inside diameter:54 mm | Conrad.com
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