Amazon.com: Hard Durable Clear Metric Polyurethane Tubing for Air and Water Applications - Inner Diameter 4 mm - Outer Diameter 6 mm - 100 ft : Industrial & Scientific
Polyethylen-Schlauch PE Pneumatikschlauch, 6mm, 50 Meter Rolle, Farbe: blau : Amazon.de: Baumarkt
Amazon.com: uxcell Straight Brass Barb Fitting Reducer, Fit Hose ID 6mm to 4mm 3pcs : Industrial & Scientific
Amazon.com: MECCANIXITY Foam Grip Tubing Handle Grips 1/4"(6mm) ID 3/16"(5mm) Wall Thick 5ft Black Non-slip for Fitness, Tools Handle Support : Sports & Outdoors
Amazon.com : Muc Off No Puncture Hassle Tubeless Sealant, 1 Liter - Advanced Bicycle Tyre Sealant with UV Tracer Dye That Seals Tears and Holes Up to 6mm : Sports & Outdoors
Amazon.com : Drip Irrigation Plugs (50 pcs) and Hole Punch Tool (1 pcs): Goof Plugs for Hose or Tubing End Caps - Puncture to Insert Fittings and Parts : Patio, Lawn & Garden