Find great deals on eBay for 8mm id tube and 8mm id tube aluminium. Shop with confidence. ... (20 Bar) - Diesel Tube - SAE J30 R6 WP. 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 16mm, 19mm, 25mm. Brand new. ... See more like this Nylon Air pipe /Tube/Pipe 8mm od x 6 mm id 1 metre length.