Used to connect with polyethylene, nylon and PU / PA / PE / PVC tubing. Simple push in design for connecting to the tube and provide secure connection, requires no extra sealing. Release ring on two ends facilitates pneumatic installations in confined spaces. Fluid Type: Air/Vacuum/Water Working Pressure: 0-1MPa; Working Temperature:0-60C Specification: 4mm: Tube Diameter: 4mm=5/32" Size: Approx.30x10mm/1.18x0.39 inch 6mm: Tube Diameter: 6mm=1/4" Size: Approx.36x14mm/1.42x0.55 inch 8mm: Tube Diameter: 8mm=5/16" Size: Approx.38x15mm/1.50x0.59 inch 10mm: Tube Diameter: 10mm=3/8" Size: Approx.42x18mm/1.65x0.71 inch 12mm: Tube Diameter: 12mm=1/2" Size: Approx.48x23mm/1.89x0.91 inch 14mm: Tube Diameter: 14mm=0.55" Size: Approx.47x20mm/1.85x0.79 inch 16mm: Tube Diameter: 16mm=0.63" Size: Approx.47x25mm/1.85x0.98 inch Material: Plastic Color: Black Package Includes: 20 Pieces Connectors (2 Pack)