good looking top notch Caliber 16mm plastic tube meet Consistent efficiently
BD 367985 Plastic Tube, Conventional Stopper, 16mm x 125mm, 10.0mL, Red/ Gray, Paper Label, Silica/ Gel, 100/bx (Minimum Expiry Lead is 90 days) (Continental US Only) Sold as bx
10Pcs Clear Plastic Test Tube with Cap D: 12/13/15/16mm L : 60/75/100mm | eBay
Amazon.com: uxcell PVC Rigid Round Tubing, Plastic Water Pipe 16mm(5/8") ID x 20mm(3/4") OD 0.5m, Gray : Industrial & Scientific
Transparent Acrylic Hard Tube Pipe Od 8mm 10mm 12mm 14mm 16mm 18mm 20mm Pmma Pc Water Cooling Rigid Tube 50cm Length - Fluid Diy Cooling & Accessories - AliExpress