Polycarbonate construction w/ 2 female Luer connections and 1 male slip connectionThe Luer connections can be attached directly to a 60 ml Syringe for environmental sampling.It can also be used to connect tubing as an on/off stop valve for air or gas flow with the Luer to Barb Adapter. This accessory allows you to connect any of our 1/4" OD(Outer Diameter) tubing or any tubing with a .17" to .19" ID(Inner Diameter).