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sourcingmap 2 Meter Blue Silicone Vacuum Tube Hose 4mm ID 8mm OD for Car : Amazon.co.uk: Automotive
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Silicone Vacuum Hose Kit - 3.5mm 3mm 4mm 5mm - 5ft of each - 4 strands - Blue | eBay
Silicone 4MM ID X 30M Vacuum Boost Hose - Yellow - Automotive Air Filters | Ramair Filters