This is a plastic PK series 5 port 8mm pneumatic fitting used for air flow.
Specifications:
Tubing Outer Diameter: 4mm,6mm,8mm 10mm,12mmOD Hose
Operating Pressure: 0~10.2kgf/cm2 (0~1.0Mpa)
Negative Pressure: -750mmhg (10 Torr)
Operating Temperature Range: 0~60C
Fit for Tube Material: PU / Nylon, Polyurethane